Publications of Thomas C. Mehen    :chronological  alphabetical  combined listing:

%% Papers Published   
@article{fds328273,
   Author = {Bain, R and Makris, Y and Mehen, T and Dai, L and Leibovich,
             AK},
   Title = {NRQCD Confronts LHCb Data on Quarkonium Production within
             Jets.},
   Journal = {Physical Review Letters},
   Volume = {119},
   Number = {3},
   Pages = {032002},
   Year = {2017},
   Month = {July},
   url = {http://dx.doi.org/10.1103/physrevlett.119.032002},
   Abstract = {We analyze the recent LHCb measurement of the distribution
             of the fraction of the transverse momentum, z(J/ψ), carried
             by the J/ψ within a jet. LHCb data are compared with
             analytic calculations using the fragmenting jet function
             (FJF) formalism for studying J/ψ in jets. Logarithms in the
             FJFs are resummed using Dokshitzer-Gribov-Lipatov-Altarelli-Parisi
             evolution. We also convolve hard QCD partonic cross
             sections, showered with pythia, with leading order
             nonrelativistic quantum chromodynamics (NRQCD) fragmentation
             functions and obtain consistent results. Both approaches use
             madgraph to calculate the hard process that creates the jet
             initiating parton. These calculations give reasonable
             agreement with the z(J/ψ) distribution that was shown to be
             poorly described by default pythia simulations in the LHCb
             paper. We compare our predictions for the J/ψ distribution
             using various extractions of nonperturbative NRQCD
             long-distance matrix elements (LDMEs) in the literature.
             NRQCD calculations agree with LHCb data better than default
             pythia regardless of which fit to the LDMEs is used. LDMEs
             from fits that focus exclusively on high transverse momentum
             data from colliders are in good agreement with the LHCb
             measurement.},
   Doi = {10.1103/physrevlett.119.032002},
   Key = {fds328273}
}

@article{fds327375,
   Author = {Yao, X and Mehen, T and Müller, B},
   Title = {Dynamical screening of resonant scattering and thermal
             nuclear scattering rate in a plasma},
   Journal = {Physical Review D},
   Volume = {95},
   Number = {11},
   Year = {2017},
   Month = {June},
   url = {http://dx.doi.org/10.1103/PhysRevD.95.116002},
   Doi = {10.1103/PhysRevD.95.116002},
   Key = {fds327375}
}

@article{fds322008,
   Author = {Bain, R and Makris, Y and Mehen, T},
   Title = {Transverse momentum dependent fragmenting jet functions with
             applications to quarkonium production},
   Journal = {The Journal of High Energy Physics},
   Volume = {2016},
   Number = {11},
   Year = {2016},
   Month = {November},
   url = {http://dx.doi.org/10.1007/JHEP11(2016)144},
   Doi = {10.1007/JHEP11(2016)144},
   Key = {fds322008}
}

@article{fds322009,
   Author = {Yao, X and Mehen, T and Müller, B},
   Title = {An effective field theory approach to the stabilization of 8
             Be in a QED plasma},
   Journal = {Journal of Physics G: Nuclear and Particle
             Physics},
   Volume = {43},
   Number = {7},
   Pages = {07LT02-07LT02},
   Year = {2016},
   Month = {July},
   url = {http://dx.doi.org/10.1088/0954-3899/43/7/07LT02},
   Doi = {10.1088/0954-3899/43/7/07LT02},
   Key = {fds322009}
}

@article{fds322010,
   Author = {Bain, R and Dai, L and Hornig, A and Leibovich, AK and Makris, Y and Mehen,
             T},
   Title = {Analytic and Monte Carlo studies of jets with heavy mesons
             and quarkonia},
   Journal = {The Journal of High Energy Physics},
   Volume = {2016},
   Number = {6},
   Year = {2016},
   Month = {June},
   url = {http://dx.doi.org/10.1007/JHEP06(2016)121},
   Doi = {10.1007/JHEP06(2016)121},
   Key = {fds322010}
}

@article{fds322011,
   Author = {Hornig, A and Makris, Y and Mehen, T},
   Title = {Jet shapes in dijet events at the LHC in
             SCET},
   Journal = {The Journal of High Energy Physics},
   Volume = {2016},
   Number = {4},
   Pages = {1-41},
   Year = {2016},
   Month = {April},
   url = {http://dx.doi.org/10.1007/JHEP04(2016)097},
   Doi = {10.1007/JHEP04(2016)097},
   Key = {fds322011}
}

@article{fds287615,
   Author = {Mehen, T},
   Title = {Hadronic loops versus factorization in effective field
             theory calculations of},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {92},
   Number = {3},
   Year = {2015},
   Month = {August},
   ISSN = {1550-7998},
   url = {http://dx.doi.org/10.1103/PhysRevD.92.034019},
   Doi = {10.1103/PhysRevD.92.034019},
   Key = {fds287615}
}

@article{fds322012,
   Author = {Mehen, T},
   Title = {New tests of NRQCD from Quarkonia within
             jets},
   Journal = {PoS - Proceedings of Science},
   Volume = {26-30-May-2015},
   Year = {2015},
   Month = {January},
   Abstract = {I review the current status of quarkonium production theory
             based on the non-relativistic QCD factorization formalism
             (NRQCD). While this theory describes much of the world's
             data on J=y and ¡ production, there are still outstanding
             problems, most notably the polarization of quarkonia at
             large pT in hadron colliders. In this talk we will present
             new tests of NRQCD involving the distribution of quarkonia
             within jets. The distribution of hadrons within jets is
             determined by nonperturbative functions called fragmenting
             jet functions (FJFs). FJFs are convolutions of fragmentation
             functions, evolved to the jet energy scale, with
             perturbatively calculable matching coefficients. I show how
             the FJFs for quarkonia can be calculated in NRQCD in terms
             of a few NRQCD long-distance matrix elements (LDME), so the
             dependence of the cross section on the energy fraction of
             the heavy quarkonium, z, is sensitive to the underlying
             production mechanism, and therefore provides a new test of
             NRQCD. The jet energy and z dependence of the cross section
             can be used to perform an independent extraction of NRQCD
             LDME. Finally, I describe ongoing work building on this
             result. This includes comparison of analytic resummed
             calculations with Monte Carlo simulations for two-jet events
             in e + e - collisions with B mesons, and three-jet events
             with J=y, as well as the definition of boost invariant jet
             substructure variables and calculation of a boost invariant
             soft function that are necessary for analytic calculations
             of jet cross sections at the Large Hadron Collider.
             QCD.},
   Key = {fds322012}
}

@article{fds287614,
   Author = {Baumgart, M and Leibovich, AK and Mehen, T and Rothstein,
             IZ},
   Title = {Probing quarkonium production mechanisms with jet
             substructure},
   Journal = {The Journal of High Energy Physics},
   Volume = {2014},
   Number = {11},
   Year = {2014},
   Month = {November},
   url = {http://arxiv.org/abs/arXiv:1406.2295},
   Doi = {10.1007/JHEP11(2014)003},
   Key = {fds287614}
}

@article{fds287618,
   Author = {Kim, C and Idilbi, A and Mehen, T and Yoon, YW},
   Title = {Production of stoponium at the LHC},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {89},
   Number = {7},
   Year = {2014},
   Month = {April},
   ISSN = {1550-7998},
   url = {http://arxiv.org/abs/arXiv:1401.1284},
   Doi = {10.1103/PhysRevD.89.075010},
   Key = {fds287618}
}

@article{fds221123,
   Author = {Thomas Mehen and Joshua W. Powell},
   Title = {Line shapes in Υ(5S)→B(∗) B(∗)π
             with Z(10610) and Z(10650) using effective field
             theory},
   Journal = {Phys. Rev. D88:034017},
   Year = {2013},
   url = {http://arxiv.org/abs/1306.5459},
   Key = {fds221123}
}

@article{fds287621,
   Author = {Mehen, T and Powell, JW},
   Title = {Line shapes in Υ(5S)→B(*)B
             ̄(*)π with Z(10610) and Z(10650)
             using effective field theory},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {88},
   Number = {3},
   Year = {2013},
   ISSN = {1550-7998},
   url = {http://dx.doi.org/10.1103/PhysRevD.88.034017},
   Abstract = {The Belle Collaboration recently discovered two resonances,
             Z b(10610) and Zb(10650) - denoted Zb and Zb′ - in the
             decays Υ(5S)→Υ(nS)π+π - for n=1, 2, or 3, and
             Υ(5S)→hb(mP) π+π- for m=1 or 2. These resonances lie
             very close to the B*B̄ and B*B̄* thresholds, respectively.
             A recent Belle analysis of the three-body decays
             Υ(5S)→[B(*)B̄( *)]â̂π± gives further evidence for
             the existence of these states. In this paper we analyze this
             decay using an effective theory of B mesons interacting via
             strong short-range interactions. Some parameters in this
             theory are constrained using existing data on
             Υ(5S)→B(*)B̄( *) decays, which requires the inclusion of
             heavy quark spin symmetry violating operators. We then
             calculate the differential distribution for
             Υ(5S)→B(*)B̄(*) π as a function of the invariant mass
             of the B(*)B ̄(*) pair, obtaining qualitative agreement
             with experimental data. We also calculate angular
             distributions in the decay Υ(5S)→Zb(′)π which are
             sensitive to the molecular character of the Zb(′). © 2013
             American Physical Society.},
   Doi = {10.1103/PhysRevD.88.034017},
   Key = {fds287621}
}

@article{fds287622,
   Author = {Fleming, S and Leibovich, AK and Mehen, T and Rothstein,
             IZ},
   Title = {Anomalous dimensions of the double parton fragmentation
             functions},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {87},
   Number = {7},
   Year = {2013},
   ISSN = {1550-7998},
   url = {http://arxiv.org/abs/arXiv:1301.3822},
   Abstract = {Double parton fragmentation is a process in which a pair of
             partons produced in the short-distance process hadronize
             into the final state hadron. This process is important for
             quarkonium production when the transverse momentum is much
             greater than the quark mass. Resummation of logarithms of
             the ratio of these two scales requires the evolution
             equations for double parton fragmentation functions (DPFF).
             In this paper we complete the one-loop evaluation of the
             anomalous dimensions for the DPFF. We also consider possible
             mixing between the DPFF and single parton power suppressed
             gluon fragmentation and show that such effects are
             subleading. © 2013 American Physical Society.},
   Doi = {10.1103/PhysRevD.87.074022},
   Key = {fds287622}
}

@article{fds287643,
   Author = {Mehen, T and Yang, D-L},
   Title = {The role of charmed meson loops in charmonium
             decays},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {85},
   Number = {1},
   Year = {2012},
   ISSN = {1550-7998},
   url = {http://dx.doi.org/10.1103/PhysRevD.85.014002},
   Abstract = {We investigate the effect of intermediate charmed meson
             loops on the M1 radiative decays J/ψ→η cγ and ψ
             ′→ηc(′)γ as well as the isospin [SU(3)] violating
             hadronic decays ψ ′→J/ψπ0(η) using heavy hadron
             chiral perturbation theory. The calculations include tree
             level as well as one loop diagrams and are compared to the
             latest data from CLEO and BES-III. Our fit constrains the
             couplings of 1S and 2S charmonium multiplets to charmed
             mesons, denoted g 2 and g2′, respectively. We find that
             there are two sets of solutions for g 2 and g2′. One set,
             which agrees with previous values of the product g 2g2′
             extracted from analyses that consider only loop
             contributions to ψ ′→ J/ψπ0(η), can only fit data on
             radiative decays with fine-tuned cancellations between tree
             level diagrams and loops in that process. The other solution
             for g 2 and g2′ leads to couplings that are smaller by a
             factor of 2.3. In this case tree level and loop
             contributions are of comparable size and the numerical
             values of the tree level contributions to radiative decays
             are consistent with estimates based on the quark model as
             well as nonrelativistic QCD. This result shows that tree
             level heavy hadron chiral perturbation theory couplings are
             as important as the one loop graphs with charmed mesons in
             these charmonium decays. The couplings g 2 and g2′ are
             also important for the calculations of the decays of charmed
             meson bound states, such as the X(3872), to conventional
             charmonia. © 2012 American Physical Society.},
   Doi = {10.1103/PhysRevD.85.014002},
   Key = {fds287643}
}

@article{fds287645,
   Author = {Fleming, S and Mehen, T},
   Title = {Decay of the X(3872) into χ cJ and the operator
             product expansion in effective field theory},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {85},
   Number = {1},
   Year = {2012},
   ISSN = {1550-7998},
   url = {http://dx.doi.org/10.1103/PhysRevD.85.014016},
   Abstract = {We consider a low-energy effective theory for the X(3872)
             (XEFT) that can be used to systematically analyze the decay
             and production of the X(3872) meson, assuming that it is a
             weakly bound state of charmed mesons. In a previous paper,
             we calculated the decays of X(3872) into χ cJ plus pions
             using a two-step procedure in which Heavy Hadron Chiral
             Perturbation Theory (HHχPT) amplitudes are matched onto
             XEFT operators and then X(3872) decay rates are calculated
             using these operators. The procedure leads to IR divergences
             in the three-body decay X(3872)→χ cJππ when virtual D
             mesons can go on shell in tree level HHχPT diagrams. In
             previous work, we regulated these IR divergences with the D
             *0 width. In this work, we carefully analyze X(3872)→χ
             cJπ0 and X(3872)→χ cJππ using the operator product
             expansion in XEFT. Forward scattering amplitudes in HHχPT
             are matched onto local operators in XEFT, the imaginary
             parts of which are responsible for the decay of the X(3872).
             Here we show that the IR divergences are regulated by the
             binding momentum of the X(3872) rather than the width of the
             D *0 meson. In the operator product expansion, these IR
             divergences cancel in the calculation of the matching
             coefficients so the correct predictions for the X(3872)→χ
             c1ππ do not receive enhancements due to the width of the D
             *0. We give updated predictions for the decay X(3872)→χ
             c1ππ at leading order in XEFT. © 2012 American Physical
             Society.},
   Doi = {10.1103/PhysRevD.85.014016},
   Key = {fds287645}
}

@article{fds287646,
   Author = {Fleming, S and Leibovich, AK and Mehen, T and Rothstein,
             IZ},
   Title = {Systematics of quarkonium production at the LHC and double
             parton fragmentation},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {86},
   Number = {9},
   Year = {2012},
   ISSN = {1550-7998},
   url = {http://arxiv.org/abs/1301.3822},
   Abstract = {In this paper, we discuss the systematics of quarkonium
             production at the LHC. In particular, we focus on the
             necessity to sum logs of the form log(Q/p ≥) and log(p
             ≥/m Q). We show that the former contributions are power
             suppressed, while the latter, whose contribution in
             fragmentation is well known, also arise in the short
             distance (i.e., nonfragmentation) production mechanisms.
             Though these contributions are suppressed by powers of m Q/p
             ≥, they can be enhanced by inverse powers of v, the
             relative velocity between heavy quarks in the quarkonium. In
             the limit p ≥m Q, short-distance production can be thought
             of as the fragmentation of a pair of partons (i.e., the
             heavy quark and antiquark) into the final state quarkonium.
             We derive an all-order factorization theorem for this
             process in terms of double parton fragmentation functions
             and calculate the one-loop anomalous dimension matrix for
             the double parton fragmentation functions. © 2012 American
             Physical Society.},
   Doi = {10.1103/PhysRevD.86.094012},
   Key = {fds287646}
}

@article{fds287647,
   Author = {Mehen, T and Yang, D-L},
   Title = {On the Role of Charmed Meson Loops in Charmonium
             Decays},
   Journal = {Phys.Rev. D85:014002},
   Year = {2012},
   url = {http://arxiv.org/abs/1111.3884},
   Key = {fds287647}
}

@article{fds287648,
   Author = {Fleming, S and Mehen, T},
   Title = {The decay of the X(3872) into &chicJ and the Operator
             Product Expansion in XEFT},
   Journal = {Phys.Rev. D85:014016},
   Year = {2012},
   url = {http://arxiv.org/abs/1110.0265},
   Key = {fds287648}
}

@article{fds287644,
   Author = {Mehen, T and Powell, JW},
   Title = {Heavy quark symmetry predictions for weakly bound B-meson
             molecules},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {84},
   Number = {11},
   Year = {2011},
   ISSN = {1550-7998},
   url = {http://arxiv.org/abs/1109.3479},
   Abstract = {Recently the Belle collaboration discovered two resonances,
             Z b(10610) and Z b(10650), that lie very close to the BB ̄*
             and B *B ̄* thresholds, respectively. It is natural to
             suppose that these are molecular states of bottom and
             antibottom mesons. Under this assumption, we introduce an
             effective field theory for the Z b(10610) and Z b(10650), as
             well as similar unobserved states that are expected on the
             basis of heavy quark spin symmetry. The molecules are
             assumed to arise from short-range interactions that respect
             heavy quark spin symmetry. We use the theory to calculate
             line shapes in the vicinity of B( *)B ̄(*) thresholds as
             well as two-body decay rates of the new bottom meson bound
             states. We derive new heavy quark spin symmetry predictions
             for the parameters appearing in the line shapes as well as
             the total and partial widths of the states. © 2011 American
             Physical Society.},
   Doi = {10.1103/PhysRevD.84.114013},
   Key = {fds287644}
}

@article{fds287649,
   Author = {Mehen, T and Springer, R},
   Title = {Radiative Decays of X(3872) &rarr &psi(2S) &gamma and
             &psi(4040) &rarr X(3872) &gamma in Effective Field
             Theory},
   Journal = {Phys.Rev.D83:094009},
   Volume = {83},
   Number = {9},
   Year = {2011},
   ISSN = {1550-7998},
   url = {http://arxiv.org/abs/1101.5175},
   Abstract = {Heavy hadron chiral perturbation theory (HHχPT) and XEFT
             are applied to the decays X(3872)→ψ(2S)γ and
             ψ(4040)→X(3872)γ under the assumption that the
             X(3872) is a molecular bound state of neutral charm mesons.
             In these decays the emitted photon energies are 181MeV and
             165MeV, respectively, so HHχPT can be used to calculate
             the underlying D0D ̄0*+D̄0D0 *→ψ(2S)γ
             or ψ(4040)→(D0D ̄0*+D̄0D0*) γ
             transition. These amplitudes are matched onto XEFT to obtain
             decay rates. The decays receive contributions from both
             long-distance and short-distance processes. We study the
             polarization of the ψ(2S) in the decay
             X(3872)→ψ(2S)γ and the angular distribution of
             X(3872) in the decay ψ(4040)→X(3872)γ and find
             they can be used to differentiate between different decay
             mechanisms as well as discriminate between 2-+ and 1++
             quantum number assignments of the X(3872). © 2011
             American Physical Society.},
   Doi = {10.1103/PhysRevD.83.094009},
   Key = {fds287649}
}

@article{fds305720,
   Author = {Mehen, T and Springer, R},
   Title = {Radiative decays X(3872)→ψ(2S)γ and ψ(4040)→X(3872)
             γ in effective field theory},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {83},
   Number = {9},
   Year = {2011},
   ISSN = {1550-7998},
   url = {http://dx.doi.org/10.1103/PhysRevD.83.094009},
   Abstract = {Heavy hadron chiral perturbation theory (HHχPT) and XEFT
             are applied to the decays X(3872)→ψ(2S)γ and
             ψ(4040)→X(3872)γ under the assumption that the X(3872)
             is a molecular bound state of neutral charm mesons. In these
             decays the emitted photon energies are 181MeV and 165MeV,
             respectively, so HHχPT can be used to calculate the
             underlying D0D ̄0*+D̄0D0 *→ψ(2S)γ or ψ(4040)→(D0D
             ̄0*+D̄0D0*) γ transition. These amplitudes are matched
             onto XEFT to obtain decay rates. The decays receive
             contributions from both long-distance and short-distance
             processes. We study the polarization of the ψ(2S) in the
             decay X(3872)→ψ(2S)γ and the angular distribution of
             X(3872) in the decay ψ(4040)→X(3872)γ and find they can
             be used to differentiate between different decay mechanisms
             as well as discriminate between 2-+ and 1++ quantum number
             assignments of the X(3872). © 2011 American Physical
             Society.},
   Doi = {10.1103/PhysRevD.83.094009},
   Key = {fds305720}
}

@article{fds287650,
   Author = {Idilbi, A and Kim, C and Mehen, T},
   Title = {Pair production of color-octet scalars at the
             LHC},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {82},
   Number = {7},
   Year = {2010},
   ISSN = {1550-7998},
   url = {http://hdl.handle.net/10161/4280 Duke open
             access},
   Abstract = {Heavy colored scalar particles, which exist in many models
             of new physics, can be pair produced at the LHC via
             gluon-gluon fusion and possibly form quarkoniumlike bound
             states. If the scalars are also charged under the
             electroweak gauge group, these bound states can then decay
             into electroweak bosons. This yields a resonant cross
             section for final states such as γγ that can exceed
             standard model backgrounds. This paper studies this process
             in the Manohar-Wise model of color-octet scalars (COS).
             Important threshold logarithms and final state Coulomb-like
             QCD interactions are resummed using effective field theory.
             We compute the resummed cross section for gluon-gluon fusion
             to COS pairs at the LHC as well as the resonant cross
             section for octetonium decaying to γγ. The latter cross
             section exceeds the standard model diphoton cross section
             when the COS mass is less than 500 (350) GeV for
             √s=14(7)TeV. Nonobservation of resonances below these
             energies can significantly improve existing bounds on COS
             masses. © 2010 The American Physical Society.},
   Doi = {10.1103/PhysRevD.82.075017},
   Key = {fds287650}
}

@article{fds287651,
   Author = {Braaten, E and Hammer, H-W and Mehen, T},
   Title = {Scattering of an ultrasoft pion and the X(3872)},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {82},
   Number = {3},
   Year = {2010},
   ISSN = {1550-7998},
   url = {http://hdl.handle.net/10161/4278 Duke open
             access},
   Abstract = {The identification of the X(3872) as a loosely-bound
             charm-meson molecule allows it to be described by an
             effective field theory, called XEFT, for the D*D̄, DD̄*,
             and DD̄π sector of QCD at energies small compared to the
             pion mass. We point out that this effective field theory can
             be extended to the sector that includes an additional pion
             and used to calculate cross sections for the scattering of a
             pion and the X(3872). If the collision energy is much
             smaller than the pion mass, the cross sections are
             completely calculable at leading order in terms of the
             masses and widths of the charm mesons, pion masses, and the
             binding energy of the X(3872). We carry out an explicit
             calculation of the cross section for the breakup of the
             X(3872) into D*+D̄*0 by the scattering of a very low energy
             π+. ©2010 The American Physical Society.},
   Doi = {10.1103/PhysRevD.82.034018},
   Key = {fds287651}
}

@article{fds287652,
   Author = {Idilbi, A and Kim, C and Mehen, T},
   Title = {Factorization and resummation for single color-octet scalar
             production at the LHC},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {79},
   Number = {11},
   Year = {2009},
   ISSN = {1550-7998},
   url = {http://arXiv.org/abs/0903.3668},
   Abstract = {Heavy colored scalar particles appear in a variety of new
             physics (NP) models and could be produced at the Large
             Hadron Collider. Knowing the total production cross section
             is important for searching for these states and establishing
             bounds on their masses and couplings. Using soft-collinear
             effective theory, we derive a factorization theorem for the
             process pp→SX, where S is a color-octet scalar, that is
             applicable to any NP model provided the dominant production
             mechanism is gluon-gluon fusion. The factorized result for
             the inclusive cross section is similar to that for the
             standard model Higgs production; however, differences arise
             due to color exchange between initial and final states. We
             provide formulas for the total cross section with large
             (partonic) threshold logarithms resummed to next-to-leading
             logarithm accuracy. The resulting K factors are similar to
             those found in Higgs production. We apply our formalism to
             the Manohar-Wise model and find that the next-to-leading
             logarithm cross section is roughly 2 times (3 times) as
             large as the leading order cross section for a color-octet
             scalar of mass of 500 GeV (3 TeV). A similar enhancement
             should appear in any NP model with color-octet scalars. ©
             2009 The American Physical Society.},
   Doi = {10.1103/PhysRevD.79.114016},
   Key = {fds287652}
}

@article{fds287653,
   Author = {Kim, C and Mehen, T},
   Title = {Color octet scalar bound states at the LHC},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {79},
   Number = {3},
   Year = {2009},
   ISSN = {1550-7998},
   url = {http://arXiv.org/abs/0903.3668},
   Abstract = {One possible extension of the standard model scalar sector
             includes SU(2)L doublet scalars that are color octets rather
             than singlets. We focus on models in which the couplings to
             fermions are consistent with the principle of minimal flavor
             violation, in which case these color-octet scalars couple
             most strongly to the third generation of quarks. When the
             Yukawa coupling of color-octet scalars to standard model
             fermions is less than unity, these states can live long
             enough to bind into color-singlet spin-0 hadrons, which we
             call octetonia. In this paper, we consider the phenomenology
             of octetonia at the Large Hadron Collider. Predictions for
             their production via gluon-gluon fusion and their two-body
             decays into standard model gauge bosons, Higgs bosons, and
             t̄t are presented. © 2009 The American Physical
             Society.},
   Doi = {10.1103/PhysRevD.79.035011},
   Key = {fds287653}
}

@article{fds152772,
   Author = {Thomas Mehen},
   Title = {On non-relativistic conformal field theory and trapped
             atoms: Virial theorems and the state-operator correspondence
             in three dimensions},
   Journal = {Phys. Rev. A 78, 013614},
   Year = {2008},
   url = {http://arXiv.org/abs/0712.0867},
   Abstract = {The field theory of nonrelativistic fermions interacting via
             contact interactions can be used to calculate the properties
             of few-body systems of cold atoms confined in harmonic
             traps. The state-operator correspondence of Non-Relativistic
             Conformal Field Theory (NRCFT) shows that the energy
             eigenvalues (in oscillator units) of N harmonically trapped
             fermions can be calculated from the scaling dimensions of
             N-fermion operators in the NRCFT. They are also in
             one-to-one correspondence with zero-energy, scale-invariant
             solutions to the N-body problem in free space. We show that
             these two mappings of the trapped fermion problem to free
             space problems are related by an automorphism of the SL(2,R)
             algebra of the conformal symmetry of fermions at the unitary
             limit. This automorphism exchanges the internal Hamiltonian
             of the gas with the trapping potential and hence provides a
             novel method for deriving virial theorems for trapped Fermi
             gases at the unitary limit. We also show that the
             state-operator correspondence can be applied directly in
             three spatial dimensions by calculating the scaling
             dimensions of two- and three-fermion operators and finding
             agreement with known exact results for energy levels of two
             and three trapped fermions at the unitary
             limit.},
   Key = {fds152772}
}

@article{fds287639,
   Author = {Mehen, T},
   Title = {Nonrelativistic conformal field theory and trapped atoms:
             Virial theorems and the state-operator correspondence in
             three dimensions},
   Journal = {Physical Review A - Atomic, Molecular, and Optical
             Physics},
   Volume = {78},
   Number = {1},
   Year = {2008},
   ISSN = {1050-2947},
   url = {http://dx.doi.org/10.1103/PhysRevA.78.013614},
   Abstract = {The field theory of nonrelativistic fermions interacting via
             contact interactions can be used to calculate the properties
             of few-body systems of cold atoms confined in harmonic
             traps. The state-operator correspondence of nonrelativistic
             conformal field theory (NRCFT) shows that the energy
             eigenvalues (in oscillator units) of N harmonically trapped
             fermions can be calculated from the scaling dimensions of N
             -fermion operators in the NRCFT. They are also in one-to-one
             correspondence with zero energy, scale-invariant solutions
             to the N -body problem in free space. We show that these two
             mappings of the trapped fermion problem to free space
             problems are related by an automorphism of the SL (2,R)
             algebra of the conformal symmetry of fermions at the unitary
             limit. This automorphism exchanges the internal Hamiltonian
             of the gas with the trapping potential and hence provides a
             method for deriving virial theorems for trapped Fermi gases
             at the unitary limit. We also show that the state-operator
             correspondence can be applied directly in three spatial
             dimensions by calculating the scaling dimensions of two- and
             three-fermion operators and finding agreement with known
             exact results for energy levels of two and three trapped
             fermions at the unitary limit. © 2008 The American Physical
             Society.},
   Doi = {10.1103/PhysRevA.78.013614},
   Key = {fds287639}
}

@article{fds287654,
   Author = {Fleming, S and Mehen, T},
   Title = {Hadronic decays of the X(3872) to χcJ in effective field
             theory},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {78},
   Number = {9},
   Year = {2008},
   ISSN = {1550-7998},
   url = {http://arXiv.org/abs/0807.2674v2},
   Abstract = {The decays of the X(3872) to P-wave quarkonia are calculated
             under the assumption that it is a shallow bound state of
             neutral charmed mesons. The X(3872) is described using an
             effective theory of nonrelativistic D mesons and pions
             (X-EFT). We calculate X(3872) decays by first matching heavy
             hadron chiral perturbation theory (HHχPT) amplitudes for
             D0D̄ *0→χcJ(π0,ππ) onto local operators in X-EFT, and
             then using these operators to calculate the X(3872) decays.
             This procedure reproduces the factorization theorems for
             X(3872) decays to conventional quarkonia previously derived
             using the operator product expansion. For single pion
             decays, we find nontrivial dependence on the pion energy
             from HHχPT diagrams with virtual D mesons. This nontrivial
             energy dependence can potentially modify heavy-quark
             symmetry predictions for the relative sizes of decay rates.
             At leading order, decays to final states with two pions are
             dominated by the final state χc1π0π0, with a branching
             fraction just below that for the decay to χc1π0. Decays to
             all other final states with two pions are highly suppressed.
             © 2008 The American Physical Society.},
   Doi = {10.1103/PhysRevD.78.094019},
   Key = {fds287654}
}

@article{fds287655,
   Author = {Kim, C and Leibovich, AK and Mehen, T},
   Title = {Nonperturbative charming penguin contributions to isospin
             asymmetries in radiative B decays},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {78},
   Number = {5},
   Year = {2008},
   ISSN = {1550-7998},
   url = {http://arXiv.org/abs/0805.1735},
   Abstract = {Recent experimental data on the radiative decays B→Vγ,
             where V is a light vector meson, find small isospin
             violation in B→K*γ while isospin asymmetries in B→ργ
             are of order 20%, with large uncertainties. Using
             soft-collinear effective theory, we calculate isospin
             asymmetries in these radiative B decays up to O(1/mb), also
             including O(vαs) contributions from nonperturbative
             charming penguins (NPCP). In the absence of NPCP
             contributions, the theoretical predictions for the
             asymmetries are a few percent or less. Including the NPCP
             can significantly increase the isospin asymmetries for both
             B→Vγ modes. We also consider the effect of the NPCP on
             the branching ratio and CP asymmetries in B±→ V±γ. ©
             2008 The American Physical Society.},
   Doi = {10.1103/PhysRevD.78.054024},
   Key = {fds287655}
}

@article{fds287617,
   Author = {Mehen, T},
   Title = {Heavy quark-diquark symmetry and &ChiPT for doubly heavy
             baryons},
   Journal = {Chiral Dynamics 2006 - Proceedings of the 5th International
             Workshop on Chiral Dynamics, Theory and Experiment, CD
             2006},
   Pages = {299-301},
   Year = {2007},
   Month = {December},
   Abstract = {A chiral Lagrangian incorporating heavy quark-diquark
             symmetry is used to calculate doubly charm baryon
             electromagnetic decays and chiral corrections to doubly
             heavy baryon masses. Quenched and partially quenched
             versions of the theory allow one to derive chiral
             extrapolation formulae for lattice QCD simulations of doubly
             heavy baryons.},
   Key = {fds287617}
}

@article{fds287656,
   Author = {Fleming, S and Kusunoki, M and Mehen, T and Kolck,
             UV},
   Title = {Pion interactions in the X(3872)},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {76},
   Number = {3},
   Year = {2007},
   ISSN = {1550-7998},
   url = {http://arXiv.org/abs/hep-ph/0703168},
   Abstract = {We consider pion interactions in an effective field theory
             of the narrow resonance X(3872), assuming it is a weakly
             bound molecule of the charm mesons D0D̄*0 and D*0D̄0.
             Since the hyperfine splitting of the D0 and D*0 is only 7
             MeV greater than the neutral pion mass, pions can be
             produced near threshold and are nonrelativistic. We show
             that pion exchange can be treated in perturbation theory and
             calculate the next-to-leading-order correction to the
             partial decay width Γ[X→D0D̄0π0]. © 2007 The American
             Physical Society.},
   Doi = {10.1103/PhysRevD.76.034006},
   Key = {fds287656}
}

@article{fds287657,
   Author = {Idilbi, A and Mehen, T},
   Title = {Equivalence of soft and zero-bin subtractions at two
             loops},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {76},
   Number = {9},
   Year = {2007},
   ISSN = {1550-7998},
   url = {http://arXiv.org/abs/0707.1101},
   Abstract = {Calculations of collinear correlation functions in
             perturbative QCD and soft-collinear effective theory require
             a prescription for subtracting soft or zero-bin
             contributions in order to avoid double counting the
             contributions from soft modes. At leading order in λ, where
             λ is the soft-collinear effective theory expansion
             parameter, the zero-bin subtractions have been argued to be
             equivalent to convolution with soft Wilson lines. We give a
             proof of the factorization of naive collinear Wilson lines
             that is crucial for the derivation of the equivalence. We
             then check the equivalence by computing the non-Abelian
             two-loop mixed collinear-soft contribution to the jet
             function in the quark form factor. These results demonstrate
             the equivalence, which can be used to give a nonperturbative
             definition of the zero-bin subtraction at lowest order in
             λ. © 2007 The American Physical Society.},
   Doi = {10.1103/PhysRevD.76.094015},
   Key = {fds287657}
}

@article{fds287658,
   Author = {Idilbi, A and Mehen, T},
   Title = {On the equivalence of soft and zero-bin subtractions},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {75},
   Number = {11},
   Year = {2007},
   ISSN = {1550-7998},
   url = {http://arXiv.org/abs/hep-ph/0702022},
   Abstract = {Zero-bin subtractions are required to avoid double counting
             soft contributions in collinear loop integrals in
             soft-collinear effective theory (SCET). In traditional
             approaches to factorization, double counting is avoided by
             dividing jet functions by matrix elements of soft Wilson
             lines. In this paper, we compare the two approaches to
             double counting, studying the quark form factor and deep
             inelastic scattering (DIS) as xB→1 as examples. We explain
             how the zero-bin subtractions in SCET are required to
             reproduce the well-established factorization theorem for DIS
             as xB→1. We study one-loop virtual contributions to the
             quark form factor and real gluon emission diagrams in DIS.
             The two approaches to double counting are equivalent if
             dimensional regularization (DR) is used to regulate infrared
             (IR) divergences. We discuss in detail ambiguities in the
             calculation of one-loop scaleless integrals in DR in SCET
             and perturbative QCD. We also demonstrate a nontrivial check
             of the equivalence of the zero-bin subtraction and the soft
             Wilson line subtraction in the virtual two-loop Abelian
             contributions to the quark form factor. © 2007 The American
             Physical Society.},
   Doi = {10.1103/PhysRevD.75.114017},
   Key = {fds287658}
}

@article{fds287616,
   Author = {Leibovich, A and Fleming, S and Mehen, T},
   Title = {J/φ photoproduction at the endpoint},
   Journal = {Annual Meeting of the Division of Particles and Fields of
             the American Physical Society, DPF 2006, and the Annual Fall
             Meeting of the Japan Particle Physics Community},
   Year = {2006},
   Month = {January},
   Key = {fds287616}
}

@article{fds287619,
   Author = {Fleming, S and Leibovich, AK and Mehen, T},
   Title = {J/Ψ photo-production at large z in soft collinear effective
             theory},
   Journal = {Proceedings of the Ringberg Workshop on New Trends in HERA
             Physics 2005},
   Pages = {239-250},
   Year = {2006},
   Month = {January},
   url = {http://arxiv.org/abs/hep-ph/0512194},
   Abstract = {One of the outstanding problems in J/Ψ physics is a
             systematic understanding of the differential
             photo-production cross section dσ/dz(γ+p → J/Ψ + X),
             where z = E Ψ ,/E gamma; / in the proton rest frame. The
             theoretical prediction based on the nonrelativistic QCD
             (NRQCD) factorization formalism has a color-octet
             contribution which grows rapidly in the endpoint region, z
             -→ 1, spoiling perturbation theory. In addition there are
             subleading operators which are enhanced by powers of 1/(1 -
             z) and they must be resummed to all orders. Here an update
             of a systematic analysis is presented. The approach used to
             organize the endpoint behavior of the photoproduction cross
             section is based on a combination of NRQCD and soft
             collinear effective theory. While a final result is not yet
             available, an intermediate result indicates that better
             agreement between theory and data will be achieved in this
             framework. Copyright © 2006 by World Scientific Publishing
             Co. Pte. Ltd.},
   Key = {fds287619}
}

@article{fds287620,
   Author = {Mehen, T},
   Title = {Heavy quark-diquark symmetry and X PT for Doubly Heavy
             Baryons},
   Journal = {Annual Meeting of the Division of Particles and Fields of
             the American Physical Society, DPF 2006, and the Annual Fall
             Meeting of the Japan Particle Physics Community},
   Pages = {299-301},
   Year = {2006},
   Month = {January},
   Abstract = {A chiral Lagrangian incorporating heavy quark-diquark
             symmetry is used to calculate doubly charm baryon
             electromagnetic decays and chiral corrections to doubly
             heavy baryon masses. Quenched and partially quenched
             versions of the theory allow one to derive chiral
             extrapolation formulae for lattice QCD simulations of doubly
             heavy baryons.},
   Key = {fds287620}
}

@article{fds43963,
   Author = {S. Fleming and T. Mehen},
   Title = {Doubly Heavy Baryons, Heavy Quark-Diquark Symmetry and
             NRQCD},
   Journal = {Phys. Rev. D 73, 034502},
   Year = {2006},
   url = {http://arxiv.org/abs/hep-ph/0509313},
   Abstract = {In the heavy quark limit, properties of heavy mesons and
             doubly heavy baryons are related by heavy quark-diquark
             symmetry. This problem is reanalyzed in the framework of
             Non-Relativistic QCD (NRQCD). We introduce a novel method
             for deriving Potential NRQCD (pNRQCD) Lagrangians for
             composite fields from vNRQCD, which contains quarks and
             antiquarks as explicit degrees of freedom and maintains
             manifest power counting in the velocity via a label
             formalism. A Hubbard-Stratonovich transformation is used to
             eliminate four quark interactions in vNRQCD and then quarks
             and antiquarks are integrated out to get effective
             Lagrangians for composite fields. This method is used to
             rederive Lagrangians for the Q\bar Q and QQ sectors of
             pNRQCD and give a correct derivation of the O(1/m_Q)
             prediction for the hyperfine splitting of doubly heavy
             baryons.},
   Key = {fds43963}
}

@article{fds287637,
   Author = {Hu, J and Mehen, T},
   Title = {Chiral Lagrangian with heavy quark-diquark
             symmetry},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {73},
   Number = {5},
   Year = {2006},
   ISSN = {1550-7998},
   url = {http://arxiv.org/abs/hep-ph/0511321},
   Abstract = {We construct a chiral Lagrangian for doubly heavy baryons
             and heavy mesons that is invariant under heavy quark-diquark
             symmetry at leading order and includes the leading O(1/mQ)
             symmetry violating operators. The theory is used to predict
             the electromagnetic decay width of the J=32 member of the
             ground state doubly heavy baryon doublet. Numerical
             estimates are provided for doubly charm baryons. We also
             calculate chiral corrections to doubly heavy baryon masses
             and strong decay widths of low lying excited doubly heavy
             baryons. © 2006 The American Physical Society.},
   Doi = {10.1103/PhysRevD.73.054003},
   Key = {fds287637}
}

@article{fds287638,
   Author = {Fleming, S and Mehen, T},
   Title = {Doubly heavy baryons, heavy quark-diquark symmetry, and
             nonrelativistic QCD},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {73},
   Number = {3},
   Year = {2006},
   ISSN = {1550-7998},
   url = {http://dx.doi.org/10.1103/PhysRevD.73.034502},
   Abstract = {In the heavy quark limit, properties of heavy mesons and
             doubly heavy baryons are related by heavy quark-diquark
             symmetry. This problem is reanalyzed in the framework of
             nonrelativistic QCD (NRQCD). We introduce a novel method for
             deriving potential NRQCD (pNRQCD) Lagrangians for composite
             fields from vNRQCD, which contains quarks and antiquarks as
             explicit degrees of freedom and maintains manifest power
             counting in the velocity via a label formalism. A
             Hubbard-Stratonovich transformation is used to eliminate
             four quark interactions in vNRQCD and then quarks and
             antiquarks are integrated out to get effective Lagrangians
             for composite fields. This method is used to rederive
             Lagrangians for the QQ̄ and QQ sectors of pNRQCD and give a
             correct derivation of the O(1/mQ) prediction for the
             hyperfine splitting of doubly heavy baryons. © 2006 The
             American Physical Society.},
   Doi = {10.1103/PhysRevD.73.034502},
   Key = {fds287638}
}

@article{fds287661,
   Author = {Fleming, S and Leibovich, AK and Mehen, T},
   Title = {Resummation of large endpoint corrections to color-octet
             J/ψ photoproduction},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {74},
   Number = {11},
   Year = {2006},
   ISSN = {1550-7998},
   url = {http://arxiv.org/abs/hep-ph/0607121},
   Abstract = {An unresolved problem in J/ψ phenomenology is a systematic
             understanding of the differential photoproduction cross
             section, dσ/dz[γ+p→J/ψ+X], where z=Eψ/Eγ in the
             proton rest frame. In the nonrelativistic QCD (NRQCD)
             factorization formalism, fixed-order perturbative
             calculations of color-octet mechanisms suffer from large
             perturbative and nonperturbative corrections that grow
             rapidly in the endpoint region, z→1. In this paper, NRQCD
             and soft collinear effective theory are combined to resum
             these large corrections to the color-octet photoproduction
             cross section. We derive a factorization theorem for the
             endpoint differential cross section involving the parton
             distribution function and the color-octet J/ψ shape
             functions. A one-loop matching calculation explicitly
             confirms our factorization theorem at next-to-leading order.
             Large perturbative corrections are resummed using the
             renormalization group. The calculation of the color-octet
             contribution to dσ/dz is in qualitative agreement with
             data. Quantitative tests of the universality of color-octet
             matrix elements require improved knowledge of shape
             functions entering these calculations as well as resummation
             of the color-singlet contribution which accounts for much of
             the total cross section and also peaks near the endpoint. ©
             2006 The American Physical Society.},
   Doi = {10.1103/PhysRevD.74.114004},
   Key = {fds287661}
}

@article{fds287662,
   Author = {Mehen, T and Tiburzi, BC},
   Title = {Doubly heavy baryons and quark-diquark symmetry in quenched
             and partially quenched chiral perturbation
             theory},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {74},
   Number = {5},
   Year = {2006},
   ISSN = {1550-7998},
   url = {http://arxiv.org/abs/hep-lat/0607023},
   Abstract = {We extend the chiral Lagrangian with heavy quark-diquark
             symmetry to quenched and partially quenched theories. These
             theories are used to derive formulas for the chiral
             extrapolation of masses and hyperfine splittings of double
             heavy baryons in lattice QCD simulations. A quark-diquark
             symmetry prediction for the hyperfine splittings of heavy
             mesons and doubly heavy baryons is rather insensitive to
             chiral corrections in both quenched and partially quenched
             QCD. Extrapolation formulas for the doubly heavy baryon
             electromagnetic transition moments are also determined for
             the partially quenched theory. © 2006 The American Physical
             Society.},
   Doi = {10.1103/PhysRevD.74.054505},
   Key = {fds287662}
}

@article{fds287668,
   Author = {Mehen, T and Springer, RP},
   Title = {Even- and Odd-Parity Charmed Meson Masses in Heavy Hadron
             Chiral Perturbation Theory},
   Journal = {Phys Rev D},
   Volume = {72},
   Number = {034006},
   Pages = {1-12},
   Year = {2005},
   Month = {March},
   ISSN = {1550-7998},
   url = {http://arxiv.org/abs/hep-ph/0503134},
   Abstract = {We derive mass formulas for the ground state, JP=0- and 1-,
             and first excited even-parity, JP=0+ and 1+, charmed mesons
             including one-loop chiral corrections and O(1/mc)
             counterterms in heavy hadron chiral perturbation theory. We
             show that including these counterterms is critical for
             fitting the current data. We find that certain parameter
             relations in the parity doubling model are not renormalized
             at one-loop, providing a natural explanation for the
             observed equality of the hyperfine splittings of ground
             state and excited doublets. © 2005 The American Physical
             Society.},
   Doi = {10.1103/PhysRevD.72.034006},
   Key = {fds287668}
}

@article{fds287669,
   Author = {Mehen, T},
   Title = {Excited Ds (and pentaquarks) in chiral
             perturbation theory},
   Journal = {Acta Physica Polonica, Series B.},
   Volume = {36},
   Number = {7},
   Pages = {2341-2350},
   Year = {2005},
   ISSN = {0587-4254},
   url = {http://arxiv.org/abs/hep-ph/0506219},
   Abstract = {I present results of a heavy hadron chiral perturbation
             theory analysis of the decays and masses of the recently
             discovered excited charm mesons. The present data on the
             electromagnetic branching ratios are consistent with heavy
             quark symmetry predictions and disfavor a molecular
             interpretation of these states. I also discuss model
             independent predictions for the strong decays of pentaquarks
             in the 10̄ representation of SU(3) which can be used to
             constrain the angular momentum and parity quantum numbers of
             these states.},
   Key = {fds287669}
}

@article{fds287670,
   Author = {Mehen, T and Tiburzi, BC},
   Title = {Quarks with twisted boundary conditions in the epsilon
             regime},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {72},
   Number = {1},
   Pages = {1-9},
   Year = {2005},
   ISSN = {1550-7998},
   url = {http://arxiv.org/abs/hep-lat/0505014},
   Abstract = {We study the effects of twisted boundary conditions on the
             quark fields in the epsilon regime of chiral perturbation
             theory. We consider the SU(2)LxSU(2)R chiral theory with
             nondegenerate quarks and the SU(3)LxSU(3)R chiral theory
             with massless up and down quarks and massive strange quarks.
             The partition function and condensate are derived for each
             theory. Because flavor-neutral Goldstone bosons are
             unaffected by twisted boundary conditions chiral symmetry is
             still restored in finite volumes. The dependence of the
             condensate on the twisting parameters can be used to extract
             the pion decay constant from simulations in the epsilon
             regime. The relative contribution to the partition function
             from sectors of different topological charge is numerically
             insensitive to twisted boundary conditions. © 2005 The
             American Physical Society.},
   Doi = {10.1103/PhysRevD.72.014501},
   Key = {fds287670}
}

@article{fds305719,
   Author = {Mehen, T and Springer, RP},
   Title = {Even- and odd-parity charmed meson masses in heavy hadron
             chiral perturbation theory},
   Journal = {Physical Review D - Particles, Fields, Gravitation, and
             Cosmology},
   Volume = {72},
   Number = {3},
   Pages = {1-12},
   Year = {2005},
   ISSN = {1550-7998},
   url = {http://dx.doi.org/10.1103/PhysRevD.72.034006},
   Abstract = {We derive mass formulas for the ground state, JP=0- and 1-,
             and first excited even-parity, JP=0+ and 1+, charmed mesons
             including one-loop chiral corrections and O(1/mc)
             counterterms in heavy hadron chiral perturbation theory. We
             show that including these counterterms is critical for
             fitting the current data. We find that certain parameter
             relations in the parity doubling model are not renormalized
             at one-loop, providing a natural explanation for the
             observed equality of the hyperfine splittings of ground
             state and excited doublets. © 2005 The American Physical
             Society.},
   Doi = {10.1103/PhysRevD.72.034006},
   Key = {fds305719}
}

@article{fds287613,
   Author = {Mehen, T and Springer, RP},
   Title = {Heavy-quark symmetry and the electromagnetic decays of
             excited charmed strange mesons},
   Journal = {Physical Review D: Particles, Fields, Gravitation and
             Cosmology},
   Volume = {70},
   Number = {7},
   Pages = {074014-1-074014-12},
   Year = {2004},
   Month = {January},
   ISSN = {0556-2821},
   url = {http://dx.doi.org/10.1103/PhysRevD.70.074014},
   Abstract = {Heavy-hadron chiral perturbation theory (HH < inf > χ <
             /inf > PT) is applied to the decays of the even-parity
             charmed strange mesons, D < inf > s0 < /inf > (2317) and D <
             inf > s1 < /inf > (2460). Heavy-quark spin-symmetry predicts
             the branching fractions for the three electromagnetic decays
             of these states to the ground states D < inf > s < /inf >
             and D < inf > s < /inf > * in terms of a single parameter.
             The resulting predictions for two of the branching fractions
             are significantly higher than current upper limits from the
             CLEO experiment. Leading corrections to the branching ratios
             from chiral loop diagrams and spin-symmetry violating
             operators in the HH < inf > χ < /inf > PT Lagrangian can
             naturally account for this discrepancy. Finally the proposal
             that the D < inf > s0 < /inf > (2317) (D < inf > s1 < /inf >
             (2460)) is a hadronic bound state of a D(D*) meson and a
             kaon is considered. Leading order predictions for
             electromagnetic branching ratios in this molecular scenario
             are in very poor agreement with existing
             data.},
   Doi = {10.1103/PhysRevD.70.074014},
   Key = {fds287613}
}

@article{fds29799,
   Author = {T. Mehen and R. P. Springer},
   Title = {Heavy-Quark Symmetry and the Electromagnetic Decays of
             Excited Charm Strange Mesons},
   Journal = {Phys. Rev. D70, 074014},
   Year = {2004},
   url = {http://arxiv.org/abs/hep-ph/0407181},
   Abstract = {Heavy-hadron chiral perturbation theory (HH$\chi$PT) is
             applied to the decays of the even-parity charmed strange
             mesons, D_{s0}(2317) and D_{s1}(2460). Heavy-quark spin
             symmetry predicts the branching fractions for the three
             electromagnetic decays of these states to the ground states
             D_s and D_s^* in terms of a single parameter. The resulting
             predictions for two of the branching fractions are
             significantly higher than current upper limits from the CLEO
             experiment. Leading corrections to the branching ratios from
             chiral loop diagrams and spin-symmetry violating operators
             in the HH$\chi$PT Lagrangian can naturally account for this
             discrepancy. Finally the proposal that the D_{s0}(2317)
             (D_{s1}(2460)) is a hadronic bound state of a D (D^*) meson
             and a kaon is considered. Leading order predictions for
             electromagnetic branching ratios in this molecular scenario
             are in very poor agreement with existing
             data.},
   Key = {fds29799}
}

@article{fds287612,
   Author = {Braaten, E and Kusunoki, M and Jia, Y and Mehen, T},
   Title = {Λ<inf>c</inf><sup>+</sup>/Λ<inf>c</inf><sup>-</sup>
             asymmetry in hadroproduction from heavy-quark
             recombination},
   Journal = {Physical Review D: Particles, Fields, Gravitation and
             Cosmology},
   Volume = {70},
   Number = {5},
   Pages = {054021-1-054021-5},
   Year = {2004},
   ISSN = {0556-2821},
   url = {http://dx.doi.org/10.1103/PhysRevD.70.054021},
   Abstract = {Asymmetries in the hadroproduction of charm particles
             directly probe power corrections to the QCD factorization
             theorems. In this paper, the heavy-quark recombination
             mechanism, a power correction that explains charm meson
             asymmetries, is extended to charm baryons. In this
             mechanism, a light quark participates in the hard-scattering
             that creates a charm quark and they hadronize together into
             a charm baryon. This provides a natural and economical
             explanation for the Λ&lt;inf&gt;c&lt;/inf&gt;&lt;sup&gt;+&lt;/sup&gt;/Λ&lt;inf&gt;c&lt;/inf&gt;
             &lt;sup&gt;-&lt;/sup&gt; asymmetries measured in πN pN
             collisions.},
   Doi = {10.1103/PhysRevD.70.054021},
   Key = {fds287612}
}

@article{fds287635,
   Author = {Braaten, E and Kusunoki, M and Jia, Y and Mehen, T},
   Title = {Λc+c-
             asymmetry in hadroproduction from heavy-quark
             recombination},
   Journal = {Physical Review D - Particles, Fields, Gravitation and
             Cosmology},
   Volume = {70},
   Number = {5},
   Pages = {054021-1-054021-5},
   Year = {2004},
   url = {http://dx.doi.org/10.1103/PhysRevD.70.054021},
   Abstract = {Asymmetries in the hadroproduction of charm particles
             directly probe power corrections to the QCD factorization
             theorems. In this paper, the heavy-quark recombination
             mechanism, a power correction that explains charm meson
             asymmetries, is extended to charm baryons. In this
             mechanism, a light quark participates in the hard-scattering
             that creates a charm quark and they hadronize together into
             a charm baryon. This provides a natural and economical
             explanation for the Λc+/Λc- asymmetries measured in πN pN
             collisions.},
   Doi = {10.1103/PhysRevD.70.054021},
   Key = {fds287635}
}

@article{fds287663,
   Author = {Mehen, T},
   Title = {Charm production asymmetries from heavy-quark
             recombination},
   Journal = {Journal of Physics G: Nuclear and Particle
             Physics},
   Volume = {30},
   Number = {1},
   Pages = {S295-S304},
   Year = {2004},
   url = {http://arxiv.org/abs/hep-ph/0306178},
   Abstract = {Charm asymmetries in fixed-target hadroproduction
             experiments are sensitive to power corrections to the QCD
             factorization theorem for heavy quark production. A power
             correction called heavy-quark recombination has recently
             been proposed to explain these asymmetries. In heavy-quark
             recombination, a light quark or antiquark participates in a
             hard scattering which produces a charm-anticharm quark pair.
             The light quark or antiquark emerges from the scattering
             with small momentum in the rest frame of the charm quark,
             and together they hadronize into a charm particle. The cross
             section for this process can be calculated within
             perturbative QCD up to an overall normalization. Heavy-quark
             recombination explains the observed D meson and ΛC
             asymmetries with a minimal set of universal nonperturbative
             parameters.},
   Doi = {10.1088/0954-3899/30/1/035},
   Key = {fds287663}
}

@article{fds287664,
   Author = {Mehen, T},
   Title = {Recent developments in heavy quark and quarkonium
             production},
   Journal = {Acta Physica Polonica, Series B.},
   Volume = {35},
   Number = {1},
   Pages = {121-129},
   Year = {2004},
   ISSN = {0587-4254},
   url = {http://arxiv.org/abs/hep-ph/0312239},
   Abstract = {Recent measurements of J/ψ production in e+e- colliders
             pose a challenge to the NRQCD factorization theorem for
             quarkonium production. Discrepancies between leading order
             calculations of color-octet contributions and the momentum
             distribution of J/ψ observed by Belle and BaBar are
             resolved by resumming large perturbative and nonperturbative
             corrections that are enhanced near the kinematic endpoint.
             The large cross sections for J/ψcc̄ and double quarkonium
             production remain poorly understood. Nonperturbative effects
             in fixed-target hadroproduction of open charm are also
             discussed. Large asymmetries in the production of charm
             mesons and baryons probe nonperturbative corrections to the
             QCD factorization theorem. A power correction called
             heavy-quark recombination can economically explain these
             asymmetries with a few universal parameters.},
   Key = {fds287664}
}

@article{fds287665,
   Author = {Braaten, E and Kusunoki, M and Jia, Y and Mehen, T},
   Title = {$\Lambda_c^+/\Lambda^-_c$ Asymmetry in Hadroproduction for
             Heavy-Quark Recombination},
   Journal = {Phys. Rev. D70, 054021},
   Year = {2004},
   url = {http://arxiv.org/abs/hep-ph/0304280},
   Abstract = {Asymmetries in the hadroproduction of charm particles
             directly probe power corrections to the QCD factorization
             theorems. In this paper, the heavy-quark recombination
             mechanism, a power correction that explains charm meson
             asymmetries, is extended to charm baryons. In this
             mechanism, a light quark participates in the hard scattering
             that creates a charm quark and they hadronize together into
             a charm baryon. This provides a natural and economical
             explanation for the \Lambda_c^+/\Lambda_c^- asymmetries
             measured in \pi N and p N collisions.},
   Key = {fds287665}
}

@article{fds287666,
   Author = {Mehen, T and Springer, RP},
   Title = {Heavy-quark symmetry and the electromagnetic decays of
             excited charmed strange mesons},
   Journal = {Physical Review D - Particles, Fields, Gravitation and
             Cosmology},
   Volume = {70},
   Number = {7},
   Pages = {074014-1-074014-12},
   Year = {2004},
   url = {http://dx.doi.org/10.1103/PhysRevD.70.074014},
   Abstract = {Heavy-hadron chiral perturbation theory (HHχPT) is applied
             to the decays of the even-parity charmed strange mesons,
             Ds0(2317) and Ds1(2460). Heavy-quark spin-symmetry predicts
             the branching fractions for the three electromagnetic decays
             of these states to the ground states Ds and Ds* in terms of
             a single parameter. The resulting predictions for two of the
             branching fractions are significantly higher than current
             upper limits from the CLEO experiment. Leading corrections
             to the branching ratios from chiral loop diagrams and
             spin-symmetry violating operators in the HHχPT Lagrangian
             can naturally account for this discrepancy. Finally the
             proposal that the Ds0(2317) (D s1(2460)) is a hadronic bound
             state of a D(D*) meson and a kaon is considered. Leading
             order predictions for electromagnetic branching ratios in
             this molecular scenario are in very poor agreement with
             existing data.},
   Doi = {10.1103/PhysRevD.70.074014},
   Key = {fds287666}
}

@article{fds287667,
   Author = {Mehen, T and Schat, C},
   Title = {Determining pentaquark quantum numbers from strong
             decays},
   Journal = {Physics Letters, Section B: Nuclear, Elementary Particle and
             High-Energy Physics},
   Volume = {588},
   Number = {1-2},
   Pages = {67-73},
   Year = {2004},
   url = {http://arxiv.org/abs/hep-ph/0401107},
   Abstract = {Assuming that the recently observed Θ+ and Ξ- are members
             of an anti-decuplet of SU(3), decays to ground state baryons
             and mesons are calculated using an effective Lagrangian
             which incorporates chiral and SU(3) symmetry. We consider
             the possible quantum number assignments JΠ=12±,32± and
             calculate ratios of partial widths. The branching ratios of
             exotic cascades can be used to discriminate between even and
             odd parity pentaquarks. © 2004 Published by Elsevier
             B.V.},
   Doi = {10.1016/j.physletb.2004.03.039},
   Key = {fds287667}
}

@article{fds287633,
   Author = {Kaiser, R and Manohar, AV and Mehen, T},
   Title = {Isospin violation in e+e- →
             BB̄},
   Journal = {Physical Review Letters},
   Volume = {90},
   Number = {14},
   Pages = {142001/1-142001/4},
   Year = {2003},
   url = {http://arxiv.org/abs/hep-ph/0208194},
   Abstract = {An overview is given of the computation of R+/0. The result
             depends on two parameters: the Β*Βπ coupling and δc,
             which represents the isospin violating part of the Y(4S)
             coupling to Β̄Β states.},
   Key = {fds287633}
}

@article{fds287671,
   Author = {Fleming, S and Leibovich, AK and Mehen, T},
   Title = {Resumming the color-octet contribution to
             e+e-→J/ψ+X},
   Journal = {Physical Review D: Particles, Fields, Gravitation and
             Cosmology},
   Volume = {68},
   Number = {9},
   Year = {2003},
   ISSN = {0556-2821},
   url = {http://arxiv.org/abs/hep-ph/0306139},
   Abstract = {Recent observations of the spectrum of J/ψ produced in e+e-
             collisions at the Υ(4S) resonance are in conflict with
             fixed-order calculations using the nonrelativistic QCD
             effective field theory. One problem is that leading order
             color-octet mechanisms predict an enhancement of the cross
             section for J/ψ with a maximal energy that is not observed
             in the data. However, in this region of phase space large
             perturbative corrections (Sudakov logarithms) as well as
             enhanced nonperturbative effects are important. In this
             paper we use the newly developed soft-collinear effective
             theory (SCET) to systematically include these effects. We
             find that these corrections significantly broaden the
             color-octet contribution to the J/ψ spectrum. Our
             calculation employs a one-stage renormalization group
             evolution rather than the two-stage evolution used in
             previous SCET calculations. We give a simple argument for
             why the two methods yield identical results to lowest order
             in the SCET power counting. © The American Physical
             Society.},
   Doi = {10.1103/PhysRevD.68.094011},
   Key = {fds287671}
}

@article{fds287672,
   Author = {Mehen, T and Wecht, B},
   Title = {Gauge Fields and Scalars in Rolling Tachyon
             Backgrounds},
   Journal = {JHEP 0302},
   Volume = {7},
   Number = {2},
   Pages = {58},
   Year = {2003},
   url = {http://arxiv.org/abs/hep-th/0206212},
   Abstract = {We investigate the dynamics of gauge and scalar fields on
             unstable D-branes with rolling tachyons. Assuming an FRW
             metric on the brane, we find a solution of the tachyon
             equation of motion which is valid for arbitrary tachyon
             potentials and scale factors. The equations of motion for a
             U(1) gauge field and a scalar field in this background are
             derived. These fields see an effective metric which differs
             from the original FRW metric. The field equations receive
             large corrections due to the curvature of the effective
             metric as well as the time variation of the gauge coupling.
             The equations of state for these fields resemble those of
             nonrelativistic matter rather than massless
             particles.},
   Key = {fds287672}
}

@article{fds305718,
   Author = {Mehen, T and Wecht, B},
   Title = {Gauge fields and scalars in rolling tachyon
             backgrounds},
   Journal = {Journal of High Energy Physics},
   Volume = {7},
   Number = {2},
   Pages = {1313-1326},
   Year = {2003},
   Abstract = {We investigate the dynamics of gauge and scalar fields on
             unstable D-branes with rolling tachyons. Assuming an FRW
             metric on the brane, we find a solution of the tachyon
             equation of motion which is valid for arbitrary tachyon
             potentials and scale factors. The equations of motion for a
             U(1) gauge field and a scalar field in this background are
             derived. These fields see an effective metric which differs
             from the original FRW metric. The field equations receive
             large corrections due to the curvature of the effective
             metric as well as the time variation of the gauge coupling.
             The equations of state for these fields resemble those of
             nonrelativistic matter rather than those of massless
             particles. © SISSA/ISAS 2003.},
   Key = {fds305718}
}

@article{fds3887,
   Author = {E. Braaten and Yu Jia and T. Mehen},
   Title = {The Leading Particle Effect From Heavy-Quark
             Recombination},
   Journal = {Phys. Rev. Lett. 89, 122002},
   Year = {2002},
   url = {http://arxiv.org/abs/hep-ph/0205149},
   Abstract = {The leading particle effect in charm hadroproduction is an
             enhancement of the cross section for a charmed hadron D in
             the forward direction of the beam when the beam hadron has a
             valence parton in common with the D. The large D+/D-
             asymmetry observed by the E791 experiment is an example of
             this phenomenon. We show that the heavy-quark recombination
             mechanism provides an economical explanation for this
             effect. In particular, the D+/D- asymmetry can be fit
             reasonably well using a single parameter whose value is
             consistent with a recent determination from charm
             photoproduction.},
   Key = {fds3887}
}

@article{fds287631,
   Author = {Braaten, E and Hammer, H-W and Mehen, T},
   Title = {Dilute Bose-Einstein condensate with large scattering
             length},
   Journal = {Physical Review Letters},
   Volume = {88},
   Number = {4},
   Pages = {404011-404014},
   Year = {2002},
   url = {http://arxiv.org/abs/cond-mat/0108380},
   Abstract = {A dilute Bose gas of atoms with large scattering length as
             compared to their range of interaction was studied. The
             energy density of a homogenous Bose-Einstein condensate
             (BEC) was calculated up to the second order in the
             low-density expansion. The instability due to three-body
             recombination was reflected by the imaginary part of a
             second order correction to energy density. The coefficient
             of the three body mean-field term in energy density was
             calculated which was found to be very large for Efimov state
             near threshold.},
   Key = {fds287631}
}

@article{fds287632,
   Author = {Braaten, E and Jia, Y and Mehen, T},
   Title = {Leading-particle effect from heavy-quark
             recombination},
   Journal = {Physical Review Letters},
   Volume = {89},
   Number = {12},
   Pages = {1220021-1220024},
   Year = {2002},
   ISSN = {0031-9007},
   Abstract = {The leading particle effect was presented quantitatively and
             economically by the heavy-quark recombination mechanism. It
             was found that the leading particle effect in charm
             hadroproduction is an enhancement of the cross section for a
             charmed hadron in the forward direction of the beam. The
             D+/D- asymmetry was also found to fit using a single
             parameter whose value was consistent with a determination
             from charm photoproduction.},
   Key = {fds287632}
}

@article{fds287659,
   Author = {Braaten, E and Yu, J and Mehen, T},
   Title = {B production asymmetries in perturbative
             QCD},
   Journal = {Physical Review D: Particles, Fields, Gravitation and
             Cosmology},
   Volume = {66},
   Number = {3},
   Year = {2002},
   ISSN = {0556-2821},
   url = {http://arxiv.org/abs/hep-ph/0108201},
   Abstract = {This paper explores a new mechanism for B production in
             which a b̄ quark combines with a light parton from the
             hard-scattering process before hadronizing into the 5
             hadron. This heavy-quark recombination mechanism can be
             calculated within perturbative QCD up to a few
             nonperturbative constants. Though suppressed at large
             transverse momentum by a factor ∧ QCDm b/p ⊥2 relative
             to b̄ fragmentation production, it can be important at
             large rapidities. A signature for this heavy-quark
             recombination mechanism in pp̄ colliders is the presence of
             rapidity asymmetries in B cross sections. Given reasonable
             assumptions about the size of nonperturbative parameters
             entering the calculation, we find that the asymmetries are
             only significant for rapidities larger than those currently
             probed by collider experiments. © 2002 The American
             Physical Society.},
   Doi = {10.1103/PhysRevD.66.034003},
   Key = {fds287659}
}

@article{fds287660,
   Author = {Manohar, AV and Mehen, T and Pirjol, D and Stewart,
             IW},
   Title = {Reparameterization invariance for collinear
             operators},
   Journal = {Physics Letters B},
   Volume = {539},
   Number = {1-2},
   Pages = {59-66},
   Year = {2002},
   ISSN = {0370-2693},
   url = {http://arxiv.org/abs/hep-ph/0204229},
   Abstract = {We discuss restrictions on operators in the soft-collinear
             effective theory (SCET) which follow from the ambiguity in
             the decomposition of collinear momenta and the freedom in
             the choice of light-like basis vectors n and n̄. Invariance
             of SCET under small changes in n and/or n̄ implies a
             symmetry of the effective theory that constrains the form of
             allowed operators with collinear fields. The restrictions
             occur at a given order in the power counting as well as
             between different orders. As an example, we present the
             complete set of higher order operators that are related to
             the collinear quark kinetic term. ©2002 Elsevier Science
             B.V. All rights reserved.},
   Doi = {10.1016/S0370-2693(02)02029-4},
   Key = {fds287660}
}

@article{fds287673,
   Author = {Braaten, E and Jia, Y and Mehen, T},
   Title = {Charm-anticharm asymmetries in photoproduction from
             heavy-quark recombination},
   Journal = {Physical Review D: Particles, Fields, Gravitation and
             Cosmology},
   Volume = {66},
   Number = {1 II},
   Pages = {140031-1400310},
   Year = {2002},
   ISSN = {0556-2821},
   url = {http://arxiv.org/abs/hep-ph/0111296},
   Abstract = {The asymmetries between charm and anticharm mesons observed
             in fixed-target photoproduction experiments are an order of
             magnitude larger than the asymmetries predicted by
             conventional perturbative QCD. We show that these charm
             meson asymmetries can be explained by a heavy-quark
             recombination mechanism for heavy meson production. In this
             process, a charm quark combines with a light antiquark from
             the hardscattering process and they subsequently hadronize
             into a state including the charm meson. This recombination
             mechanism can be calculated within perturbative QCD up to
             some nonperturbative constants. After using symmetries of
             QCD to reduce the number of free parameters to two, we
             obtain a good fit to all the data on the asymmetries for
             charmed mesons from the E687 and E691 experiments.},
   Key = {fds287673}
}

@article{fds287692,
   Author = {Hammer, H-W and Mehen, T},
   Title = {Range corrections to doublet S-wave neutron-deuteron
             scattering},
   Journal = {Physics Letters B},
   Volume = {516},
   Number = {3-4},
   Pages = {353-361},
   Year = {2001},
   ISSN = {0370-2693},
   url = {http://dx.doi.org/10.1016/S0370-2693(01)00918-2},
   Abstract = {We calculate the range corrections to S-wave
             neutron-deuteron scattering in the doublet channel (S = 1/2)
             to first order in r/a where a is the scattering length and r
             the effective range. Ultraviolet divergences appearing at
             this order can be absorbed into a redefinition of the
             leading order three-body force. The corrections to the
             elastic scattering amplitude below the deuteron breakup
             threshold are computed. Inclusion of the range corrections
             gives good agreement with measured scattering data and
             potential model calculations. © 2001 Elsevier Science B.V.
             All rights reserved.},
   Doi = {10.1016/S0370-2693(01)00918-2},
   Key = {fds287692}
}

@article{fds287693,
   Author = {Hammer, H-W and Mehen, T},
   Title = {A renormalized equation for the three-body system with
             short-range interactions},
   Journal = {Nuclear Physics A},
   Volume = {690},
   Number = {4},
   Pages = {535-546},
   Year = {2001},
   url = {http://dx.doi.org/10.1016/S0375-9474(00)00710-7},
   Abstract = {We study the three-body system with short-range interactions
             characterized by an unnaturally large two-body scattering
             length. We show that the off-shell scattering amplitude is
             cutoff independent up to power corrections. This allows us
             to derive an exact renormalization group equation for the
             three-body force. We also obtain a renormalized equation for
             the off-shell scattering amplitude. This equation is
             invariant under discrete scale transformations. The
             periodicity of the spectrum of bound states originally
             observed by Efimov is a consequence of this symmetry. The
             functional dependence of the three-body scattering length on
             the two-body scattering length can be obtained analytically
             using the asymptotic solution to the integral equation. An
             analogous formula for the three-body recombination
             coefficient is also obtained. © 2001 Elsevier Science
             B.V.},
   Doi = {10.1016/S0375-9474(00)00710-7},
   Key = {fds287693}
}

@article{fds322013,
   Author = {Fleming, S and Mehen, T and Stewart, IW},
   Title = {NN scattering 3S1-3D1
             mixing angle at next-to-next-to-leading order},
   Journal = {Physical Review C - Nuclear Physics},
   Volume = {61},
   Number = {4},
   Pages = {440051-440059},
   Year = {2000},
   Month = {January},
   Abstract = {The 3 S 1 - 3 D 1 mixing angle for nucleon-nucleon
             scattering ∈1 is calculated to next-to-next-to-leading
             order in an effective field theory with perturbative pions.
             Without pions, the low energy theory fits the observed ∈1
             well for momenta less than∼50 MeV. Including pions
             perturbatively significantly improves the agreement with
             data for momenta up to ∼150 MeV with one less parameter.
             Furthermore, for these momenta the accuracy of our
             calculation is similar to an effective field theory
             calculation in which the pion is treated nonperturbatively.
             This gives phenomenological support for a perturbative
             treatment of pions in low energy two-nucleon processes. We
             explain why it is necessary to perform spin and isospin
             traces in d dimensions when regulating divergences with
             dimensional regularization in higher partial wave
             amplitudes.},
   Key = {fds322013}
}

@article{fds3907,
   Author = {T. Mehen and I.W. Stewart},
   Title = {Nucleon-Nucleon Effective Field Theory at NNLO: Radiation
             Pions and $^1S_0$ Phase Shift},
   Series = {Proc. Inst. Nucl. Theor. 9},
   Booktitle = {Proceedings of the INT Workshop on Nuclear Physics with
             Effective Field Theory},
   Publisher = {World Scientific},
   Editor = {P. Bedaque and M. Savage and R. Seki and U. L. Van
             Kolck},
   Year = {2000},
   Abstract = {Low energy phenomena involving two nucleons can be
             successfully described using effective field theory. Because
             of the relatively large expansion parameter, it is only at
             next-to-next-to-leading order (NNLO) where one can expect to
             see agreement with experiment at the few percent level. The
             first part of this talk will focus on radiation pion
             effects, which first appear at NNLO. The power counting for
             radiation pions is simple for center of mass momentum
             p~\sqrt{M m_pi}=Q_r, the threshold for pion production. We
             explain how graphs calculated with the Q_r power counting
             scale for p~m_\pi. The Q_r^3 radiation pion contributions to
             nucleon-nucleon scattering are suppressed by inverse powers
             of the S-wave scattering lengths. However, we point out that
             order Q_r^4 radiation contributions might give a NNLO
             contribution for p~m_pi. In the second part of the talk,
             results for the potential pion and contact interaction part
             of the NNLO 1S0 phase shift are presented. We emphasize the
             importance of eliminating spurious poles in the expression
             for the amplitude at each order in the perturbative
             expansion. Doing this leaves a total of three free
             parameters at NNLO. We obtain a good fit to the 1S0 phase
             shift.},
   Key = {fds3907}
}

@article{fds287630,
   Author = {Mehen, T and Stewart, IW and Wise, MB},
   Title = {The physics of the centrality dependence of elliptic
             flow},
   Journal = {Physics Letters B},
   Volume = {474},
   Number = {1-2},
   Pages = {27-32},
   Year = {2000},
   ISSN = {0370-2693},
   url = {http://dx.doi.org/10.1016/S0370-2693(00)00017-4},
   Abstract = {The centrality dependence of elliptic flow and how it is
             related to the physics of expansion of the system created in
             high energy nuclear collisions is discussed. Since in the
             hydro limit the centrality dependence of elliptic flow is
             mostly defined by the elliptic anisotropy of the overlapping
             region of the colliding nuclei, and in the low density limit
             by the product of the elliptic anisotropy and the
             multiplicity, we argue that the centrality dependence of
             elliptic flow should be a good indicator of the degree of
             equilibration reached in the reaction. Then we analyze
             experimental data obtained at AGS and SPS energies. The
             observed difference in the centrality dependence of elliptic
             flow could imply a transition from a hadronic to a partonic
             nature of the system evolution. Finally we exploit the
             multiplicity dependence of elliptic flow to make qualitative
             predictions for RHIC and LHC. (C) 2000 Published by Elsevier
             Science B.V.},
   Doi = {10.1016/S0370-2693(00)00017-4},
   Key = {fds287630}
}

@article{fds287682,
   Author = {Mehen, T and Stewart, IW},
   Title = {Radiation pions in two-nucleon effective field
             theory},
   Journal = {Nuclear Physics A},
   Volume = {665},
   Number = {1-2},
   Pages = {164-182},
   Year = {2000},
   Abstract = {For interactions involving two or more nucleons it is useful
             to divide pions into three classes: potential, radiation,
             and soft. The momentum threshold for the production of
             radiation pions is Qr = √ MNmπ. We show that radiation
             pions can be included systematically with a power counting
             in Qr. The leading order radiation pion graphs which
             contribute to NN scattering are evaluated in the PDS and OS
             renormalization schemes and are found to give a small
             contribution. The power counting for soft pion contributions
             is also discussed. © 2000 Elsevier Science B.V. All rights
             reserved.},
   Key = {fds287682}
}

@article{fds287684,
   Author = {Fleming, S and Mehen, T and Stewart, IW},
   Title = {The NN Scattering $^3S_1-{}^3D_1$ Mixing Angle at
             NNLO},
   Journal = {Phys. Rev. C},
   Volume = {61},
   Number = {4},
   Pages = {044005},
   Year = {2000},
   Abstract = {The 3S1-3D1 mixing angle for nucleon-nucleon scattering,
             epsilon_1, is calculated to next-to-next-to-leading order in
             an effective field theory with perturbative pions. Without
             pions, the low energy theory fits the observed epsilon_1
             well for momenta less than $\sim 50$ MeV. Including pions
             perturbatively significantly improves the agreement with
             data for momenta up to $\sim 150$ MeV with one less
             parameter. Furthermore, for these momenta the accuracy of
             our calculation is similar to an effective field theory
             calculation in which the pion is treated non-perturbatively.
             This gives phenomenological support for a perturbative
             treatment of pions in low energy two-nucleon processes. We
             explain why it is necessary to perform spin and isospin
             traces in d dimensions when regulating divergences with
             dimensional regularization in higher partial wave
             amplitudes.},
   Key = {fds287684}
}

@article{fds287685,
   Author = {Mehen, T and Stewart, IW and Wise, MB},
   Title = {Conformal Invariance for Non-Relativistic Field
             Theory},
   Journal = {Phys. Lett. B},
   Volume = {474},
   Pages = {145-152},
   Year = {2000},
   Abstract = {Momentum space Ward identities are derived for the amputated
             n-point Green's functions in 3+1 dimensional
             non-relativistic conformal field theory. For n=4 and 6 the
             implications for scattering amplitudes (i.e. on-shell
             amputated Green's functions) are considered. Any scale
             invariant 2-to-2 scattering amplitude is also conformally
             invariant. However, conformal invariance imposes constraints
             on off-shell Green's functions and the three particle
             scattering amplitude which are not automatically satisfied
             if they are scale invariant. As an explicit example of a
             conformally invariant theory we consider non-relativistic
             particles in the infinite scattering length
             limit.},
   Key = {fds287685}
}

@article{fds287686,
   Author = {Fleming, S and Mehen, T and Stewart, IW},
   Title = {NNLO corrections to nucleon-nucleon scattering and
             perturbative pions},
   Journal = {Nuclear Physics A},
   Volume = {677},
   Number = {1-4},
   Pages = {313-366},
   Year = {2000},
   Abstract = {The 1S0, 3S1, and 3D1 nucleon-nucleon scattering phase
             shifts are calculated at next-to-next-to-leading order
             (NNLO) in an effective field theory. Predictions for the
             1P1, 3P0,1,2, 1D2, and 3D2,3 phase shifts at this order are
             also compared with data. The calculations treat pions
             perturbatively and include the NNLO contributions from order
             Qr3 and Qr4 radiation pion graphs. In the 3S1, 3D1 and 3P0,2
             channels we find large disagreement with the Nijmegen
             partial-wave analysis at NNLO. These spin triplet channels
             have large corrections from graphs with two potential pion
             exchange which do not vanish in the chiral limit. We compare
             our results to calculations within the Weinberg approach,
             and find that in some spin triplet channels the summation of
             potential pion diagrams seems to be necessary to reproduce
             the observed phase shifts. In the spin singlet channels the
             nonperturbative treatment of potential pions does not afford
             a significant improvement over the perturbative approach. ©
             2000 Elsevier Science B.V.},
   Key = {fds287686}
}

@article{fds287687,
   Author = {Gomis, J and Kleban, M and Mehen, T and Rangamani, M and Shenker,
             S},
   Title = {Noncommutative Gauge Dynamics from the String World
             Sheet},
   Journal = {JHEP},
   Volume = {8},
   Number = {8 PART A},
   Pages = {11},
   Year = {2000},
   Abstract = {We show how string theory can be used to reproduce the
             one-loop two-point photon amplitude in noncommutative U(1)
             gauge theory. Using a simple realization of the gauge theory
             in bosonic string theory, we extract from a string cylinder
             computation in the decoupling limit the exact one loop field
             theory result. The result is obtained entirely from the
             region of moduli space where massless open strings dominate.
             Our computation indicates that the unusual IR/UV
             singularities of noncommutative field theory do not come
             from closed string modes in any simple way.},
   Key = {fds287687}
}

@article{fds287688,
   Author = {Gomis, J and Mehen, T},
   Title = {Space-time noncommutative field theories and
             unitarity},
   Journal = {Nuclear Physics B},
   Volume = {591},
   Number = {1-2},
   Pages = {265-276},
   Year = {2000},
   Abstract = {We study the perturbative unitarity of noncommutative scalar
             field theories. Field theories with space-time
             noncommutativity do not have a unitary S-matrix. Field
             theories with only space noncommutativity are perturbatively
             unitary. This can be understood from string theory, since
             space noncommutative field theories describe a low energy
             limit of string theory in a background magnetic field. On
             the other hand, there is no regime in which space-time
             noncommutative field theory is an appropriate description of
             string theory. Whenever space-time noncommutative field
             theory becomes relevant massive open string states cannot be
             neglected. © 2000 Elsevier Science B.V.},
   Key = {fds287688}
}

@article{fds287689,
   Author = {Gomis, J and Mehen, T and Wise, MB},
   Title = {Quantum Field Theories with Compact Noncommutative Extra
             Dimensions},
   Journal = {JHEP},
   Volume = {8},
   Number = {8 PART B},
   Pages = {29},
   Year = {2000},
   Abstract = {We study field theories on spaces with additional compact
             noncommutative dimensions. As an example, we study \phi^3 on
             R^{1,3}\times T^{2}_\theta using perturbation theory. The
             infrared divergences in the noncompact theory give rise to
             unusual dynamics for the mode of \phi which is constant
             along the torus. Correlation functions involving this mode
             vanish. Moreover, we show that the spectrum of Kaluza-Klein
             excitations can be very different from the analogous
             commuting theory. There is an additional contribution to the
             Kaluza-Klein mass formula that resembles the contribution of
             winding states in string theory. We also consider the effect
             of noncommutativity on the four dimensional Kaluza-Klein
             excitations of a six dimensional gauge field.},
   Key = {fds287689}
}

@article{fds287690,
   Author = {Aharony, O and Gomis, J and Mehen, T},
   Title = {On Theories with Lightlike Noncommutativity},
   Journal = {JHEP},
   Volume = {9},
   Number = {9 PART A},
   Pages = {23},
   Year = {2000},
   Abstract = {We show that field theories with light-like
             noncommutativity, that is with $\theta^{0i}=-\theta^{1i}$,
             are unitary quantum theories, and that they can be obtained
             as decoupled field theory limits of string theory with
             D-branes in a background NS-NS $B$ field. For general
             noncommutativity parameters, we show that noncommutative
             field theories which are unitary can be obtained as
             decoupled field theory limits of string theory, while those
             that are not unitary cannot be obtained from string theory
             because massive open strings do not decouple. We study the
             different theories with light-like noncommutativity which
             arise from Type II D-branes. The decoupling limit of the
             D4-brane seems to lead to a noncommutative field theory
             deformation of the $(2,0)$ SCFT of M5-branes, while the
             D5-brane case leads to a noncommutative variation of
             ``little string theories''. We discuss the DLCQ description
             of these theories.},
   Key = {fds287690}
}

@article{fds287691,
   Author = {Mehen, T and Wise, MB},
   Title = {Generalized *-Products, Wilson Lines and the Solution of the
             Seiberg-Witten Equations},
   Journal = {JHEP},
   Volume = {12},
   Number = {12},
   Pages = {8},
   Year = {2000},
   Abstract = {Higher order terms in the effective action of noncommutative
             gauge theories exhibit generalizations of the *-product
             (e.g. *' and *-3). These terms do not manifestly respect the
             noncommutative gauge invariance of the tree level action. In
             U(1) gauge theories, we note that these generalized
             *-products occur in the expansion of some quantities that
             are invariant under noncommutative gauge transformations,
             but contain an infinite number of powers of the
             noncommutative gauge field. One example is an open Wilson
             line. Another is the expression for a commutative field
             strength tensor in terms of the noncommutative gauge field.
             Seiberg and Witten derived differential equations that
             relate commutative and noncommutative gauge transformations,
             gauge fields and field strengths. In the U(1) case we solve
             these equations neglecting terms of fourth order in the
             gauge field but keeping all orders in the noncommutative
             parameter.},
   Key = {fds287691}
}

@article{fds305713,
   Author = {Gomis, J and Mehen, T and Wise, MB},
   Title = {Quantum field theories with compact non-commutative extra
             dimensions},
   Journal = {Journal of High Energy Physics},
   Volume = {4},
   Number = {8 PART B},
   Pages = {1-15},
   Year = {2000},
   Abstract = {We study field theories on spaces with additional compact
             noncommutative dimensions. As an example, we study φ3 on
             ℝ1,3xdouble-struck T signθ2 using perturbation theory.
             The infrared divergences in the non-compact theory give rise
             to unusual dynamics for the mode of φ which is constant
             along the torus. Correlation functions involving this mode
             vanish. Moreover, we show that the spectrum of Kaluza-Klein
             excitations can be very different from the analogous
             commuting theory. There is an additional contribution to the
             Kaluza-Klein mass formula that resembles the contribution of
             winding states in string theory. We also consider the effect
             of noncommutativity on the four-dimensional Kaluza-Klein
             excitations of a six-dimensional gauge field.},
   Key = {fds305713}
}

@article{fds305714,
   Author = {Gomis, J and Mehen, T and Rangamani, M and Kleban, M and Shenker,
             S},
   Title = {Non-commutative gauge dynamics from the string
             worldsheet},
   Journal = {Journal of High Energy Physics},
   Volume = {4},
   Number = {8 PART A},
   Pages = {1-18},
   Year = {2000},
   Abstract = {We show how string theory can be used to reproduce the
             one-loop two-point photon amplitude in non-commutative U(1)
             gauge theory. Using a simple realization of the gauge theory
             in bosonic string theory, we extract from a string cylinder
             computation in the decoupling limit the exact one loop field
             theory result. The result is obtained entirely from the
             region of moduli space where massless open strings dominate.
             Our computation indicates that the unusual IR/UV
             singularities of non-commutative field theory do not come
             from closed string modes in any simple way.},
   Key = {fds305714}
}

@article{fds305715,
   Author = {Mehen, T and Wise, MB},
   Title = {Generalized *-products, Wilson lines and the solution of the
             Seiberg-Witten equations},
   Journal = {Journal of High Energy Physics},
   Volume = {4},
   Number = {12},
   Pages = {XVII-9},
   Year = {2000},
   Abstract = {Higher order terms in the effective action of
             non-commutative gauge theories exhibit generalizations of
             the *-product (e.g. *′ and *3). These terms do not
             manifestly respect the non-commutative gauge invariance of
             the tree level action. In U(1) gauge theories, we note that
             these generalized *-products occur in the expansion of some
             quantities that are invariant under non-commutative gauge
             transformations, but contain an infinite number of powers of
             the non-commutative gauge field. One example is an open
             Wilson line. Another is the expression for a commutative
             field strength tensor Fab in terms of the non-commutative
             gauge field Âa. Seiberg and Witten derived differential
             equations that relate commutative and non-commutative gauge
             transformations, gauge fields and field strengths. In the
             U(1) case we solve these equations neglecting terms of
             fourth order in  but keeping all orders in the
             non-commutative parameter θkl.},
   Key = {fds305715}
}

@article{fds305716,
   Author = {Aharony, O and Gomis, J and Mehen, T},
   Title = {On theories with light-like noncommutativity},
   Journal = {Journal of High Energy Physics},
   Volume = {4},
   Number = {9 PART A},
   Pages = {XXXII-14},
   Year = {2000},
   Abstract = {We show that field theories with light-like
             noncommutativity, that is with θ0i = θ1i, are unitary
             quantum theories, and that they can be obtained as decoupled
             field theory limits of string theory with D-branes in a
             background NS-NS B-field. For general noncommutativity
             parameters, we show that non-commutative field theories
             which are unitary can be obtained as decoupled field theory
             limits of string theory, while those that are not unitary
             cannot be obtained from string theory because massive open
             strings do not decouple. We study the different theories
             with light-like noncommutativity which arise from type-II
             D-branes. The decoupling limit of the D4-brane seems to lead
             to a non-commutative field theory deformation of the (2,0)
             SCFT of M5-branes, while the D5-brane case leads to a
             non-commutative variation of "little string theories". We
             discuss the DLCQ description of these theories.},
   Key = {fds305716}
}

@article{fds305717,
   Author = {Fleming, S and Mehen, T and Stewart, IW},
   Title = {NN scattering 3S1-3D1
             mixing angle at next-to-next-to-leading order},
   Journal = {Physical Review C - Nuclear Physics},
   Volume = {61},
   Number = {4},
   Pages = {440051-440059},
   Year = {2000},
   Abstract = {The 3S1-3D1 mixing angle for nucleon-nucleon scattering ∈1
             is calculated to next-to-next-to-leading order in an
             effective field theory with perturbative pions. Without
             pions, the low energy theory fits the observed ∈1 well for
             momenta less than∼50 MeV. Including pions perturbatively
             significantly improves the agreement with data for momenta
             up to ∼150 MeV with one less parameter. Furthermore, for
             these momenta the accuracy of our calculation is similar to
             an effective field theory calculation in which the pion is
             treated nonperturbatively. This gives phenomenological
             support for a perturbative treatment of pions in low energy
             two-nucleon processes. We explain why it is necessary to
             perform spin and isospin traces in d dimensions when
             regulating divergences with dimensional regularization in
             higher partial wave amplitudes.},
   Key = {fds305717}
}

@article{fds3910,
   Author = {T. Mehen},
   Title = {Leptoproduction of $J/\Psi$},
   Booktitle = {Proceedings of the 29th International Conference on High
             Energy Physics (ICHEP 98)},
   Publisher = {World Scientific},
   Editor = {A. Astbury and D. Axen and J. Robinson},
   Year = {1999},
   Abstract = {I review the status of the extraction of NRQCD color-octet
             $J/\psi$ production matrix elements. Large theoretical
             uncertainties in current extractions from hadroproduction
             and photoproduction are emphasized. Leptoproduction of
             $J/\psi$ is calculated within the NRQCD factorization
             formalism. Color-octet contributions dominate the cross
             section, allowing for a reliable extraction of $<{\cal
             O}_8^{J/\psi}(^1S_0)>$ and $<{\cal O}_8^{J/\psi}(^3P_0)>$. A
             comparison with preliminary data from the H1 collaboration
             shows that leading order color-octet mechanisms agree with
             the measured total cross section for $Q^2 > 4m_c^2$, while
             the color-singlet model underpredicts the cross section by a
             factor of 5.},
   Key = {fds3910}
}

@article{fds287680,
   Author = {Mehen, T and Stewart, IW},
   Title = {A momentum subtraction scheme for two-nucleon effective
             field theory},
   Journal = {Physics Letters, Section B: Nuclear, Elementary Particle and
             High-Energy Physics},
   Volume = {445},
   Number = {3-4},
   Pages = {378-386},
   Year = {1999},
   Abstract = {We introduce a momentum subtraction scheme which obeys the
             power counting of Kaplan, Savage, and Wise (KSW), developed
             for systems with large scattering lengths, a. Unlike the
             power divergence subtraction scheme, coupling constants in
             this scheme obey the KSW scaling for μR &gt; 1/a. We
             comment on the low-energy theorems derived by Cohen and
             Hansen. We conclude that there is no obstruction to using
             perturbative pions for momenta p &gt; mπ. © 1999 Elsevier
             Science B.V. All rights reserved.},
   Key = {fds287680}
}

@article{fds287681,
   Author = {Mehen, T and Stewart, IW},
   Title = {Renormalization schemes and the range of two-nucleon
             effective field theory},
   Journal = {Physical Review C - Nuclear Physics},
   Volume = {59},
   Number = {5},
   Pages = {2365-2383},
   Year = {1999},
   Abstract = {The off-shell momentum subtraction (OS) and power divergence
             subtraction (PDS) renormalization schemes for the effective
             field theory with nucleons and pions are investigated. We
             explain in detail how the renormalization is implemented
             using local counterterms. Fits to the NN scattering data are
             performed in the 1S0 and 3S1 channels for different values
             of μR. An error analysis indicates that the range of the
             theory with perturbative pions is consistent with 500
             MeV.},
   Key = {fds287681}
}

@article{fds287683,
   Author = {Mehen, T and Stewart, IW and Wise, MB},
   Title = {Wigner symmetry in the limit of large scattering
             lengths},
   Journal = {Physical Review Letters},
   Volume = {83},
   Number = {5},
   Pages = {931-934},
   Year = {1999},
   Abstract = {We note that, in the limit where the NN 1S0 and 3S1
             scattering lengths, a(1S0) and a(3S1), go to infinity, the
             leading terms in the effective field theory for strong NN
             interactions are invariant under Wigner's SU(4) spin-isospin
             symmetry. This explains why the leading effects of radiation
             pions on the S-wave NN scattering amplitudes vanish as
             a(1S0) and a(3S1) go to infinity. The implications of Wigner
             symmetry for NN → NN axion and γd → np are also
             considered. © 1999 The American Physical
             Society.},
   Key = {fds287683}
}

@booklet{Fleming98,
   Author = {Fleming, S and Mehen, T},
   Title = {Photoproduction of h(c)},
   Journal = {Physical Review D},
   Volume = {5803},
   Number = {3},
   Pages = {art. no.-037503},
   Year = {1998},
   Month = {August},
   ISSN = {0556-2821},
   Abstract = {Using the NRQCD factorization formalism, we calculate the
             total cross section for the photoproduction of h c mesons.
             We include color-octet and color-singlet mechanisms as well
             as next-to-leading order perturbative QCD corrections. The
             theoretical prediction depends on two nonperturbative matrix
             elements that are not well determined from existing data on
             charmonium production. For reasonable values of these matrix
             elements, the cross section is large enough that the h c may
             be observable at the E831 experiment and at the DESY HERA
             experiments.},
   Key = {Fleming98}
}

@booklet{Mehen98,
   Author = {Mehen, T},
   Title = {Summing O(beta(n)(0)alpha(n+1)(s)) corrections to top quark
             decays},
   Journal = {Physics Letters B},
   Volume = {417},
   Number = {3-4},
   Pages = {353-360},
   Year = {1998},
   Month = {January},
   Abstract = {Order β0nαsn+1 QCD corrections to top quark decays
             into W+ and H+ bosons are computed to all orders in
             perturbation theory. Predictions for the radiative
             corrections to the top quark width are compared with the
             estimates from BLM scale setting procedures. The results of
             the summation are shown to greatly improve understanding of
             higher order corrections in the limit mW, mH → mt,
             where the BLM scale setting method is known to fail.
             Attempts to reduce nonperturbative error by substituting the
             running mass for the pole mass in the expression for the
             decay are shown to fail in the limit mW, mH → mt
             because of subtleties in the treatment of phase space. ©
             1998 Published by Elsevier Science B.V.},
   Key = {Mehen98}
}

@booklet{Fleming98a,
   Author = {Fleming, S and Mehen, T},
   Title = {Leptoproduction of J/ψ},
   Journal = {Physical Review D - Particles, Fields, Gravitation and
             Cosmology},
   Volume = {57},
   Number = {3},
   Pages = {1846-1857},
   Year = {1998},
   Abstract = {We study leptoproduction of J/ψ at large Q2 within the
             nonrelativistic QCD (NRQCD) factorization formalism. The
             cross section is dominated by color-octet terms that are of
             order αs. The color-singlet term, which is of order α2s,
             is shown to make a small contribution to the total cross
             section. We also calculate the tree diagrams for color-octet
             production at order α2s in a region of phase space where
             there is no leading color-octet contribution. We find that
             in this regime the color-singlet contribution dominates. We
             argue that nonperturbative corrections arising from
             diffractive leptoproduction, higher twist effects, and
             higher order terms in the NRQCD velocity expansion should be
             suppressed as Q2 is increased. Therefore, the color-octet
             matrix elements 〈script O signψ8(1S0)〉 and 〈script O
             signψ8(3P0)〉 can be reliably extracted from this process.
             Finally, we point out that an experimental measurement of
             the polarization of leptoproduced J/ψ will provide an
             excellent test of the NRQCD factorization
             formalism.},
   Key = {Fleming98a}
}

@article{fds305712,
   Author = {Fleming, S and Mehen, T},
   Title = {Photoproduction of hc},
   Journal = {Physical Review D: Particles, Fields, Gravitation and
             Cosmology},
   Volume = {58},
   Number = {3},
   Pages = {0375031-0375034},
   Year = {1998},
   ISSN = {0556-2821},
   Abstract = {Using the NRQCD factorization formalism, we calculate the
             total cross section for the photoproduction of hc mesons. We
             include color-octet and color-singlet mechanisms as well as
             next-to-leading order perturbative QCD corrections. The
             theoretical prediction depends on two nonperturbative matrix
             elements that are not well determined from existing data on
             charmonium production. For reasonable values of these matrix
             elements, the cross section is large enough that the hc may
             be observable at the E831 experiment and at the DESY HERA
             experiments.},
   Key = {fds305712}
}

@article{fds305711,
   Author = {Mehen, T},
   Title = {Summing O( β0nαsn+1)
             corrections to top quark decays},
   Journal = {Physics Letters, Section B: Nuclear, Elementary Particle and
             High-Energy Physics},
   Volume = {417},
   Number = {3-4},
   Pages = {353-360},
   Year = {1998},
   url = {http://dx.doi.org/10.1016/S0370-2693(97)01348-8},
   Abstract = {Order β0nαsn+1 QCD corrections to top quark decays into W+
             and H+ bosons are computed to all orders in perturbation
             theory. Predictions for the radiative corrections to the top
             quark width are compared with the estimates from BLM scale
             setting procedures. The results of the summation are shown
             to greatly improve understanding of higher order corrections
             in the limit mW, mH → mt, where the BLM scale setting
             method is known to fail. Attempts to reduce nonperturbative
             error by substituting the running mass for the pole mass in
             the expression for the decay are shown to fail in the limit
             mW, mH → mt because of subtleties in the treatment of
             phase space. © 1998 Published by Elsevier Science
             B.V.},
   Doi = {10.1016/S0370-2693(97)01348-8},
   Key = {fds305711}
}

@booklet{Mehen97,
   Author = {Mehen, T},
   Title = {Testing quarkonium production with photoproduced JlΨ+
             γ},
   Journal = {Physical Review D - Particles, Fields, Gravitation and
             Cosmology},
   Volume = {55},
   Number = {7},
   Pages = {4338-4343},
   Year = {1997},
   Abstract = {I compute the leading color-octet contributions to the
             process γ+p→JlΨ+ γ(+Χ) within the nonrelativistic QCD
             (NRQCD) factorization formalism. In the color-singlet model,
             JlΨ+ γ can only be produced when the photon interacts
             through its structure function, while the color-octet
             mechanism allows for production of Jl Ψ+ γ via direct
             photon-gluon fusion. Resolved photon processes can be
             distinguished easily from direct photon processes by
             examining the fraction of the incident photon energy carried
             away by the Jl Ψ in the event. Therefore, this process
             provides a conclusive test of the color-octet mechanism. Jl
             Ψ+ γ production is particularly sensitive to the NRQCD
             matrix element which figures prominently in the
             fragmentation production of Jl Ψ at large p⊥ in hadron
             colliders. I also examine the predictions of the color
             evaporation model (CEM) of quarkonium production and find
             that this process can easily discriminate between the NRQCD
             factorization formalism and the CEM.},
   Key = {Mehen97}
}

@booklet{Falk96,
   Author = {Falk, AF and Mehen, T},
   Title = {Excited heavy mesons beyond leading order in the heavy quark
             expansion},
   Journal = {Physical Review D - Particles, Fields, Gravitation and
             Cosmology},
   Volume = {53},
   Number = {1},
   Pages = {231-240},
   Year = {1996},
   Abstract = {We examine the decays of excited heavy mesons, including the
             leading power corrections to the heavy quark limit. We find
             a new and natural explanation for the large deviation of the
             width of the D1 (2420) from the heavy quark symmetry
             prediction. Our formalism leads to detailed predictions for
             the properties of the excited bottom mesons, some of which
             recently have been observed. Finally, we present a detailed
             analysis of the effect of power corrections and finite meson
             widths on the angular distributions which may be measured in
             heavy meson decays.},
   Key = {Falk96}
}

@booklet{Mehen96,
   Author = {Mehen, T},
   Title = {Scale setting in top quark decays},
   Journal = {Physics Letters, Section B: Nuclear, Elementary Particle and
             High-Energy Physics},
   Volume = {382},
   Number = {3},
   Pages = {267-272},
   Year = {1996},
   url = {http://dx.doi.org/10.1016/0370-2693(96)00681-8},
   Abstract = {We compute the O(β0α2s) QCD corrections to the Standard
             Model decay t → W+ b as well as the non standard decay t
             → H+ b. We then use our results to compute the BLM scale
             for these decays, and study the dependence of the BLM scale
             on the mass of the boson in the decay. We find that the BLM
             procedure gives extremely small scales when top decays into
             heavy bosons. When we try to improve the BLM scale by
             reexpressing rates as a functions of the top quark running
             mass, we find the BLM scale exhibits unnatural dependence on
             the boson mass, casting doubts on the applicability of the
             BLM procedure to these processes.},
   Doi = {10.1016/0370-2693(96)00681-8},
   Key = {Mehen96}
}


%% Papers Accepted   
@article{fds225631,
   Author = {Thomas Mehen},
   Title = {Exotic Quarkonium Spectroscopy: X(3872) Z(10610) Z(10650) in
             Non-Relativistic Effective Theory},
   Journal = {Conference Proeceedings for PhiPsi 2013, Rome, Italy,
             September 11, 2013},
   Year = {2013},
   Key = {fds225631}
}


%% Preprints   
@article{fds287641,
   Author = {Kim, C and Mehen, T},
   Title = {Octetonium at the LHC},
   Journal = {Nuclear Physics, Section B: Proceedings Supplements},
   Volume = {200-202},
   Number = {1 C},
   Pages = {179-182},
   Year = {2010},
   ISSN = {0920-5632},
   url = {http://arXiv.org/abs/0909.5695},
   Abstract = {Several models of new physics, such as grand unified
             theories, Pati-Salam models, chiral color models, etc.,
             predict the existence of an SU(2)L doublet of color-octet
             scalars (COS). In the Manohar-Wise model, the Yukawa
             couplings of the COS are assumed to be consistent with
             Minimal Flavor Violation ensuring constraints from flavor
             physics are satisfied even for relatively light scalars. In
             this simple model we consider the production of color
             singlet bound states of COS that we call octetonium.
             Octetonium are mainly produced via gluon-gluon fusion and
             have significant production cross sections at the LHC. They
             can decay to pairs of gluons or electroweak gauge bosons. If
             the masses of the octetonia are 1 TeV or less, these states
             will be visible as resonances in γγ, W+W-, ZZ, and γZ. ©
             2010 Elsevier B.V.},
   Doi = {10.1016/j.nuclphysbps.2010.02.081},
   Key = {fds287641}
}

@article{fds287640,
   Author = {Fleming, S and Mehen, T},
   Title = {X(3872) in effective field theory},
   Journal = {AIP Conference Proceedings},
   Volume = {1182},
   Pages = {491-494},
   Year = {2009},
   ISSN = {0094-243X},
   url = {http://arXiv.org/abs/0907.4142},
   Abstract = {If the X(3872) resonance is a shallow boundstate of a the
             charm mesons D0D̄*0 and D*0D̄0 it can be described by an
             effective theory of nonrelativistic D mesons coupled to
             nonrelativistic pions (X-EFT). In this talk, I give a brief
             overview of the X(3872), followed by a short review of
             X-EFT. I end my talk with results from calculations of the
             the next-to-leading-order correction to the partial decay
             width Γ[X→ D0D̄0π0], and the decay of X(3872) to P-wave
             quarkonia. © 2009 American Institute of
             Physics.},
   Doi = {10.1063/1.3293853},
   Key = {fds287640}
}