%% Books @book{fds52849, Author = {R. Springer and T.B. Bunton and T. Mehen}, Title = {Heavy Hadron Chiral Perturbation Theory Applied to the Charmed Meson Parity Partners}, Booktitle = {proceedings of Chiral Dynamics, Theory and Experiment}, Publisher = {World Scientific, Singapore}, Year = {2006}, Key = {fds52849} } @book{fds4091, Author = {R. P. Springer}, Title = {An Effective Theory of QCD for Hyperons and Hypernuclei}, Booktitle = {Proceedings of the Japanese Hadron Facility 1998 Conference}, Year = {1998}, Month = {Spring}, Key = {fds4091} } %% Papers Published @article{fds323249, Author = {Margaryan, A and Springer, RP and Vanasse, J}, Title = {scattering and the puzzle to next-to-next-to-next-to-leading order}, Journal = {Physical Review C}, Volume = {93}, Number = {5}, Year = {2016}, Month = {May}, url = {http://dx.doi.org/10.1103/PhysRevC.93.054001}, Doi = {10.1103/PhysRevC.93.054001}, Key = {fds323249} } @article{fds323250, Author = {Schindler, MR and Springer, RP and Vanasse, J}, Title = {Large- limit reduces the number of independent few-body parity-violating low-energy constants in pionless effective field theory}, Journal = {Physical Review C}, Volume = {93}, Number = {2}, Year = {2016}, Month = {February}, url = {http://dx.doi.org/10.1103/PhysRevC.93.025502}, Doi = {10.1103/PhysRevC.93.025502}, Key = {fds323250} } @article{fds323251, Author = {Margaryan, A and Vanasse, J and Springer, R}, Title = {Non-relativistic Neutron Deuteron Scattering}, Journal = {EPJ Web of Conferences}, Volume = {113}, Pages = {08012-08012}, Editor = {Elster, C and Phillips, D and Roberts, C}, Year = {2016}, url = {http://dx.doi.org/10.1051/epjconf/201611308012}, Doi = {10.1051/epjconf/201611308012}, Key = {fds323251} } @article{fds248391, Author = {Vanasse, J and Egolf, DA and Kerin, J and König, S and Springer, RP}, Title = {and scattering to next-to-leading order in pionless effective field theory}, Journal = {Physical Review C - Nuclear Physics}, Volume = {89}, Number = {6}, Pages = {064003}, Year = {2014}, Month = {June}, ISSN = {0556-2813}, url = {http://dx.doi.org/10.1103/PhysRevC.89.064003}, Doi = {10.1103/PhysRevC.89.064003}, Key = {fds248391} } @article{fds248393, Author = {Schindler, MR and Springer, RP}, Title = {The theory of parity violation in few-nucleon systems}, Journal = {Progress in Particle and Nuclear Physics}, Volume = {72}, Pages = {1-43}, Editor = {A. Faessler}, Year = {2013}, Month = {September}, ISSN = {0146-6410}, url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000322931000001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92}, Doi = {10.1016/j.ppnp.2013.05.002}, Key = {fds248393} } @article{fds248394, Author = {Margaryan, A and Springer, RP}, Title = {Using the decay psi (4160) -> X(3872) gamma to probe the molecular content of the X(3872)}, Journal = {Physical Review D}, Volume = {88}, Number = {1}, Year = {2013}, Month = {July}, ISSN = {1550-7998}, url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000321839500002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92}, Doi = {10.1103/PhysRevD.88.014017}, Key = {fds248394} } @article{fds248408, Author = {Griesshammer, HW and Schindler, MR and Springer, RP}, Title = {Parity-violating neutron spin rotation in hydrogen and deuterium}, Journal = {The European Physical Journal A - Hadrons and Nuclei}, Volume = {48}, Number = {1}, Pages = {7}, Year = {2012}, Month = {January}, ISSN = {1434-6001}, url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000300285400004&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92}, Doi = {10.1140/epja/i2012-12007-8}, Key = {fds248408} } @article{fds248409, Author = {Mehen, T and Springer, R}, Title = {Radiative Decays X(3872)->psi(2S) gamma and psi(4040) ->X(3872) gamma}, Journal = {Phys. Rev. D}, Volume = {83}, Pages = {094009}, Year = {2011}, Month = {January}, Key = {fds248409} } @article{fds248406, 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 = {fds248406} } @article{fds248407, Author = {Mehen, T and Springer, R}, Title = {X(3872) -> psi(2S) gamma and psi(4040) -> X(3872) gamma}, Journal = {Phys Rev D83 094009}, Year = {2011}, Key = {fds248407} } @article{fds184764, Author = {R. Springer}, Title = {Parity violation in the NN interaction}, Volume = {3}, Booktitle = {EPJ Web of Conferences, 19th International IUPAP Conference on Few- Body Problems in Physics, University of Bonn, Germany, 31 Aug – 5 Sep 2009}, Editor = {E. Epelbaum and H.-W. Hammer and U.-G. Meissner}, Year = {2010}, url = {http://dx.doi.org/10.1051/epjconf/20100307001}, Doi = {10.1051/epjconf/20100307001}, Key = {fds184764} } @article{fds248410, Author = {Schindler, MR and Springer, RP}, Title = {Two parity-violating asymmetries from np → dγ in pionless effective field theories}, Journal = {Nuclear Physics A}, Volume = {846}, Number = {1-4}, Pages = {51-62}, Year = {2010}, ISSN = {0375-9474}, url = {http://dx.doi.org/10.1016/j.nuclphysa.2010.06.002}, Abstract = {We consider parity-violating observables from the processes n→p→dγ and np → dγ. We perform calculations using pionless effective field theory both with and without explicit dibaryon fields. After combining these results with ones we have already obtained on parity-violating asymmetries in N → N scattering, experimental input would in principle allow the extraction of all five parameters occurring at leading order in the parity-violating Lagrangian. © 2010 Elsevier B.V.}, Doi = {10.1016/j.nuclphysa.2010.06.002}, Key = {fds248410} } @article{fds248395, Author = {Springer, RP and Phillips, DR and Schindler, MJ}, Title = {Parity Violation in the NN System}, Journal = {EPJ Web of Conferences}, Volume = {3}, Year = {2009}, ISSN = {2100-014X}, url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000290401000120&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92}, Doi = {10.1051/epjconf/20100307001}, Key = {fds248395} } @article{fds248403, Author = {Canham, DL and Hammer, H-W and Springer, RP}, Title = {Scattering of D and D* mesons off the X(3872)}, Journal = {Physical Review D - Particles, Fields, Gravitation, and Cosmology}, Volume = {80}, Number = {1}, Year = {2009}, ISSN = {1550-7998}, url = {http://dx.doi.org/10.1103/PhysRevD.80.014009}, Abstract = {Both the mass (just below the D*0D̄0 threshold) and the likely quantum numbers (JPC=1++) of the X(3872) suggest that it is either a weakly bound hadronic "molecule" (X(3872)∼1/2[D*0D̄0+D̄*0D0]) or a virtual state of charmed mesons. Assuming the X(3872) is a weakly bound molecule, the scattering of neutral D and D* mesons off the X(3872) can be predicted from the X(3872) binding energy. We calculate the phase shifts and cross section for scattering of D0 and D*0 mesons and their antiparticles off the X(3872) in an effective field theory for short-range interactions. This provides another example of a three-body process, along with those in nuclear and atomic systems, that displays universal properties. It may be possible to extract the scattering within the final state interactions of Bc decays and/or other LHC events. © 2009 The American Physical Society.}, Doi = {10.1103/PhysRevD.80.014009}, Key = {fds248403} } @article{fds248411, Author = {Phillips, DR and Schindler, MR and Springer, RP}, Title = {An effective-field-theory analysis of low-energy parity-violation in nucleon-nucleon scattering}, Journal = {Nuclear Physics A}, Volume = {822}, Number = {1-4}, Pages = {14-32}, Year = {2009}, ISSN = {0375-9474}, url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000265621600001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92}, Abstract = {We analyze parity-violating nucleon-nucleon scattering at energies E < mπ2 / M using the effective field theory appropriate for this regime. The minimal Lagrangian for short-range parity-violating NN interactions is written in an operator basis that encodes the five partial-wave transitions that dominate at these energies. We calculate the leading-order relationships between parity-violating NN asymmetries and the coefficients in the Lagrangian and also discuss the size of sub-leading corrections. We conclude with a discussion of further observables needed to completely determine the leading-order Lagrangian. © 2009 Elsevier B.V. All rights reserved.}, Doi = {10.1016/j.nuclphysa.2009.02.011}, Key = {fds248411} } @article{fds248412, Author = {Bedaque, PF and Buchoff, MI and Cherman, A and Springer, RP}, Title = {Can fermions save large N dimensional reduction?}, Journal = {Journal of High Energy Physics}, Volume = {2009}, Number = {10}, Pages = {070}, Year = {2009}, ISSN = {1126-6708}, url = {http://dx.doi.org/10.1088/1126-6708/2009/10/070}, Abstract = {This paper explores whether Eguchi-Kawai reduction for gauge theories with adjoint fermions is valid. The Eguchi-Kawai reduction relates gauge theories in different numbers of dimensions in the large N limit provided that certain conditions are met. In principle, this relation opens up the possibility of learning about the dynamics of 4D gauge theories through techniques only available in lower dimensions. Dimensional reduction can be understood as a special case of large N equivalence between theories related by an orbifold projection. In this work, we focus on the simplest case of dimensional reduction, relating a 4D gauge theory to a 3D gauge theory via an orbifold projection. A necessary condition for the large N equivalence between the 4D and 3D theories to hold is that certain discrete symmetries in the two theories must not be broken spontaneously. In pure 4D Yang-Mills theory, these symmetries break spontaneously as the size of one of the spacetime dimensions shrinks. An analysis of the effect of adjoint fermions on the relevant symmetries of the 4D theory shows that the fermions help stabilize the symmetries. We consider the same problem from the point of view of the lower dimensional 3D theory and find that, surprisingly, adjoint fermions are not generally enough to stabilize the necessary symmetries of the 3D theory. In fact, a rich phase diagram arises, with a complicated pattern of symmetry breaking. We discuss the possible causes and consequences of this finding. © 2009 SISSA.}, Doi = {10.1088/1126-6708/2009/10/070}, Key = {fds248412} } @article{fds248413, Author = {Canham, D and Hammer, HW and Springer, R}, Title = {On the scattering of D and D* mesons off the X(3872)}, Journal = {Phys Rev D}, Volume = {D80}, Pages = {014009}, Year = {2009}, Key = {fds248413} } @article{fds248392, Author = {Springer, RP}, Title = {HHChPT applied to the charmed-strange parity partners}, Journal = {Chiral Dynamics 2006 - Proceedings of the 5th International Workshop on Chiral Dynamics, Theory and Experiment, CD 2006}, Pages = {302-303}, Year = {2007}, Month = {December}, Abstract = {We apply heavy hadron chiral perturbation theory (HHChPT) to study the properties of the even- and odd-parity charmed-strange mesons. We find that the experimental masses and electromagnetic decay rates are consistent with HHChPT.We consider the hypothesis that the even-parity states are molecules. An RG analysis shows that once the HHChPT parameter set overlaps with the parity doubling model, the parameters remain at those values. Finally, the implications for the bottom-strange system are described.}, Key = {fds248392} } @article{fds248414, 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 = {Spring}, 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. Â© 2005 The American Physical Society.}, Doi = {10.1103/PhysRevD.72.034006}, Key = {fds248414} } @article{fds304618, 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 = {fds304618} } @article{fds248425, 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}, ISSN = {0556-2821}, 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 = {fds248425} } @article{fds248426, Author = {Egolf, DA and Springer, RP and Urban, J}, Title = {SU(3) predictions for weak decays of doubly heavy baryons, including SU(3) breaking terms}, Journal = {Physical Review D: Particles, Fields, Gravitation and Cosmology}, Volume = {68}, Number = {1}, Pages = {013003}, Year = {2003}, ISSN = {0556-2821}, url = {http://dx.doi.org/10.1103/PhysRevD.68.013003}, Abstract = {We find expressions for the weak decay amplitudes of baryons containing two b quarks (or one b and one c quark - many relationships are the same) in terms of unknown reduced matrix elements. This project was originally motivated by the request of the Fermilab run II b Physics Workshop organizers for a guide to experimentalists in their search for as yet unobserved hadrons. We include an analysis of linear SU(3) breaking terms in addition to relationships generated by unbroken SU(3) symmetry, and relate these to expressions in terms of the complete set of possible reduced matrix elements. © 2003 The American Physical Society.}, Doi = {10.1103/PhysRevD.68.013003}, Key = {fds248426} } @article{fds248428, Author = {Savage, MJ and Springer, RP}, Title = {The anapole form factor of the deuteron}, Journal = {Nuclear Physics A}, Volume = {686}, Number = {1-4}, Pages = {413-428}, Year = {2001}, Month = {Summer}, url = {http://dx.doi.org/10.1016/S0375-9474(00)00568-6}, Abstract = {We find the leading-order result for the anapole form factor of the deuteron using effective field theory. The momentum dependence of the anapole form factor is different from that of the matrix element of the strange currents in the deuteron, which may provide a way for disentangling these two competing effects when analyzing parity-violating electron-deuteron scattering experiments. We give closed form expressions for both the form factor and integrals often encountered in the NN effective field theory. © 2001 Elsevier Science B.V. All rights reserved.}, Doi = {10.1016/S0375-9474(00)00568-6}, Key = {fds248428} } @article{fds248402, Author = {Egolf, DA and Melnikov, IV and Springer, RP}, Title = {Weak nonleptonic Ω^{-}decay in chiral perturbation theory}, Journal = {Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics}, Volume = {451}, Number = {3-4}, Pages = {267-274}, Year = {1999}, Abstract = {We calculate the weak nonleptonic decay of the Ω- baryon to octet final states in heavy baryon chiral perturbation theory (HBChPT). We include the one-loop leading logarithmic effects and show that this improves the universality of the HBChPT constants. © 1999 Published by Elsevier Science B.V. All rights reserved.}, Key = {fds248402} } @article{fds248427, Author = {Springer, RP}, Title = {Heavy baryon chiral perturbation theory and the weak nonleptonic p-wave decays of the baryon octet}, Journal = {Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics}, Volume = {461}, Number = {3}, Pages = {167-174}, Year = {1999}, Month = {Spring}, Abstract = {Considerable confusion in the literature about heavy baryon chiral perturbation theory, its convergence properties, and appropriate calculational techniques, make it timely to discuss the nonleptonic p-wave decays of the octet of baryons. We present model independent results. © 1999 Published by Elsevier Science B.V. All rights reserved.}, Key = {fds248427} } @article{fds248431, Author = {Kaplan, DB and Savage, MJ and Springer, RP and Wise, MB}, Title = {An effective field theory calculation of the parity violating asymmetry in n^{→}+ p > d + γ}, Journal = {Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics}, Volume = {449}, Number = {1-2}, Pages = {1-5}, Year = {1999}, Month = {Fall}, Abstract = {Weak interactions are expected to induce a parity violating pion-nucleon coupling, hπNN(1). This coupling should be measurable in a proposed experiment to study the parity violating asymmetry Aγ in the process n→ + p → d + γ. We compute the leading dependence of Aγ on the coupling hπNN(1) using recently developed effective field theory techniques and find an asymmetry of Aγ = + 0.17 hπNN(1) at leading order. This asymmetry has the opposite sign to that given by Desplanques and Missimer. © 1999 Published by Elsevier Science B.V. All rights reserved.}, Key = {fds248431} } @article{fds248429, Author = {Chen, J-W and Griesshammer, HW and Savage, MJ and Springer, RP}, Title = {Gamma-Deuteron Compton Scattering in Effective Field Theory}, Journal = {Nuclear Physics}, Volume = {A 644}, Number = {3}, Pages = {245}, Year = {1998}, Month = {Fall}, Abstract = {The differential cross section for Î³-deuteron Compton scattering is computed to next-to-leading order (NLO) in an effective field theory that describes nucleon-nucleon interactions below the pion production threshold. Contributions at NLO include the nucleon isoscalar electric polarizability from its 1/mÏ€ behavior in the chiral limit. The parameter-free prediction of the Î³-deuteron differential cross section at NLO is in good agreement with data. Â© 1998 Elsevier Science B.V.}, Key = {fds248429} } @article{fds248430, Author = {Egolf, DA and Melnikov, IV and Springer, RP}, Title = {Weak Nonleptonic Omega Decay in Chiral Perturbation Theory}, Journal = {Physics Letters}, Volume = {B451}, Number = {267}, Year = {1998}, Month = {Fall}, Key = {fds248430} } @article{fds248401, Author = {Savage, MJ and Springer, RP}, Title = {NNK and ΛΛK amplitudes in chiral perturbation theory}, Journal = {Nuclear Physics A}, Volume = {639}, Number = {1-2}, Pages = {325c-328c}, Year = {1998}, Abstract = {We explore the S-wave and P-wave amplitudes for NNK and ΛΛK interactions using chiral perturbation theory to script O sign(ms log ms). In contrast to the large corrections found in P-wave amplitudes in the nonleptonic decay of octet baryons, the NNK amplitudes receive only small corrections to their tree-level values. The uncertainty in the ΛΛK amplitudes is found to be large.}, Key = {fds248401} } @article{fds248432, Author = {Savage, MJ and Springer, RP}, Title = {Parity violation in effective field theory and the deuteron anapole moment}, Journal = {Nuclear Physics A}, Volume = {644}, Number = {3}, Pages = {235-244}, Year = {1998}, Month = {Summer}, Abstract = {Effective field theory, including pions, provides a consistent and systematic description of nucleon-nucleon strong interactions up to center-of-mass momentum p ∼ 300 MeV per nucleon. We describe the inclusion of hadronic parity violation into this effective field theory and find an analytic form for the deuteron anapole moment at leading order in the expansion. © 1998 Elsevier Science B.V.}, Key = {fds248432} } @article{fds248433, Author = {Chen, J-W and Grießhammer, HW and Savage, MJ and Springer, RP}, Title = {The polarizability of the deuteron}, Journal = {Nuclear Physics A}, Volume = {644}, Number = {3}, Pages = {221-234}, Year = {1998}, Month = {Summer}, Abstract = {The scalar and tensor polarizabilities of the deuteron are calculated using the recently developed effective field theory that describes nucleon-nucleon interactions. Leading and next-to-leading order contributions in the perturbative expansion predict a scalar electric polarizability of αE0 = 0.595 fm3. The tensor electric polarizability receives contributions starting at next-to-leading order from the exchange of a single potential pion and is found to be αE2 = -0.062 fm3. We compute the leading contributions to the scalar and tensor magnetic polarizabilities, finding βM0 = 0.067 fm3 and βM2 = 0.195 fm3. © 1998 Elsevier Science B.V.}, Key = {fds248433} } @article{fds248434, Author = {Savage, MJ and Springer, RP}, Title = {Weak ΛΛK^{0}interaction}, Journal = {Physical Review C - Nuclear Physics}, Volume = {57}, Number = {3}, Pages = {1478-1484}, Year = {1998}, Month = {Spring}, ISSN = {0556-2813}, url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000072596600056&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92}, Abstract = {We calculate the leading contribution to the weak ΛΛK coupling in heavy baryon chiral perturbation theory, including the SU(3) breaking terms arising at one loop. This coupling gives the leading one-boson exchange amplitude for the process ΛΛ → Λn and is an important component in understanding the decay of ΛΛ hypernuclei. We predict the S-wave and P-wave amplitudes to be found in the ranges -0.5≲A(S)≲1.1 and -8.9≲A(P)≲-0.7, respectively.}, Doi = {10.1103/PhysRevC.57.1478}, Key = {fds248434} } @article{fds304617, Author = {Chen, J-W and Grießhammer, HW and Savage, MJ and Springer, RP}, Title = {γ-deuteron Compton scattering in effective field theory}, Journal = {Nuclear Physics A}, Volume = {644}, Number = {3}, Pages = {245-259}, Year = {1998}, Abstract = {The differential cross section for γ-deuteron Compton scattering is computed to next-to-leading order (NLO) in an effective field theory that describes nucleon-nucleon interactions below the pion production threshold. Contributions at NLO include the nucleon isoscalar electric polarizability from its 1/mπ behavior in the chiral limit. The parameter-free prediction of the γ-deuteron differential cross section at NLO is in good agreement with data. © 1998 Elsevier Science B.V.}, Key = {fds304617} } @booklet{Savage96, Author = {Savage, MJ and Springer, RP}, Title = {Kaon-nucleon couplings for weak decays of hypernuclei (vol C53, pg 441, 1996)}, Journal = {Physical Review C}, Volume = {54}, Number = {5}, Pages = {2786-2786}, Year = {1996}, Month = {November}, Key = {Savage96} } @booklet{Engel96, Author = {Engel, J and Frampton, PH and Springer, RP}, Title = {Effective Lagrangians and parity-conserving time-reversal violation at low energies}, Journal = {Physical Review D - Particles, Fields, Gravitation and Cosmology}, Volume = {53}, Number = {9}, Pages = {5112-5114}, Year = {1996}, Abstract = {Using effective Lagrangians, we argue that any time-reversal-violating but parity-conserving effects are too small to be observed in flavor-conserving nuclear processes without dramatic improvement in experimental accuracy. In the process we discuss other arguments that have appeared in the literature.}, Key = {Engel96} } @booklet{Savage96a, Author = {Savage, MJ and Springer, RP}, Title = {Kaon-nucleon couplings for weak decays of hypernuclei}, Journal = {Physical Review C - Nuclear Physics}, Volume = {53}, Number = {1}, Pages = {441-447}, Year = {1996}, url = {http://dx.doi.org/10.1103/PhysRevC.53.441}, Abstract = {We investigate the weak kaon-nucleon (NNK) S-wave and P-wave interactions using heavy baryon chiral perturbation theory. The leading one-loop SU(3) breaking contributions to the ppK, pnK, and nnK couplings are computed. We find that they suppress all NNK amplitudes by 30% to 50%. The ratio of neutron-induced to proton-induced hypernuclear decay widths is sensitive to such reductions. It has been argued that the discrepancy between the predicted and observed P-wave amplitudes in Δs = 1 hyperon decay results from an accidental cancellation between tree-level amplitudes, and is not a fundamental problem for chiral perturbation theory. Agreement between experimentally determined NNK P-wave amplitudes and our estimates would support this explanation.}, Doi = {10.1103/PhysRevC.53.441}, Key = {Savage96a} } @booklet{Butler94, Author = {Butler, MN and Savage, MJ and Springer, RP}, Title = {Electromagnetic moments of the baryon decuplet}, Journal = {Physical Review D: Particles, Fields, Gravitation and Cosmology}, Volume = {49}, Number = {7}, Pages = {3459-3465}, Year = {1994}, ISSN = {0556-2821}, url = {http://dx.doi.org/10.1103/PhysRevD.49.3459}, Abstract = {We compute the leading contributions to the magnetic dipole and electric quadrupole moments of the baryon decuplet in chiral perturbation theory. The measured value for the magnetic moment of the Ω- is used to determine the local counterterm for the magnetic moments. We compare the chiral perturbation theory predictions for the magnetic moments of the decuplet with those of the baryon octet and find reasonable agreement with the predictions of the large-Nc limit of QCD. The leading contribution to the quadrupole moment of the Δ and other members of the decuplet comes from one-loop graphs. The pionic contribution is shown to be proportional to Iz (and so will not contribute to the quadrupole moment of I=0 nuclei), while the contribution from kaons has both isovector and isoscalar components. The chiral logarithmic enhancement of both pion and kaon loops has a coefficient that vanishes in the SU(6) limit. The third allowed moment, the magnetic octupole, is shown to be dominated by a local counterterm with corrections arising at two loops. We briefly mention the strange counterparts of these moments. © 1994 The American Physical Society.}, Doi = {10.1103/PhysRevD.49.3459}, Key = {Butler94} } @booklet{Butler93, Author = {Butler, MN and Savage, MJ and Springer, RP}, Title = {Erratum and addendum to E2/M1 mixing ratio of Δ→Nγ and hyperon resonance radiative decay}, Journal = {Physics Letters B}, Volume = {314}, Number = {1}, Pages = {122-124}, Year = {1993}, ISSN = {0370-2693}, Abstract = {We correct an error in the definition of our amplitudes, and then discuss using γ-γ correlations to find the ratio of electric quadrupole to magnetic dipole transitions in the electromagnetic production and decay of the Δ. © 1993.}, Key = {Butler93} } @booklet{Butler93b, Author = {Butler, MN and Savage, MJ and Springer, RP}, Title = {Strong and electromagnetic decays of the baryon decuplet}, Journal = {Nuclear Physics B}, Volume = {399}, Number = {1}, Pages = {69-85}, Year = {1993}, Abstract = {To explore further the role that QCD symmetries play on hadron dynamics, we discuss the radiative decay of the baryon decuplet to the baryon octet and compute the leading non-analytic SU(3) violating corrections induced at the one-loop level. In the limit of exact flavour SU(3) symmetry two of the possible decay modes are forbidden and the rates for these two decays are dominated by loop corrections. There is only one SU(3) conserving contact term at leading order in chiral perturbation theory for the radiative decays. We determine its coefficient from the observed branching ratio for Δ → Nγ and from the present upper limit on Ξ*0 → Ξ0γ. We then predict the branching fractions for Σ*- → Σ-γ, Σ*0 → Λγ, Σ*0 → Σ0γ, Σ*+ → Σ+γ, Ξ*0γ → Ξ0γ and Ξ*- → Ξ-γ. Some of the decay modes are predicted to have branching fractions near the current experimental upper limit and could possibly be observed in the near future. The leading corrections to the octet-decuplet-meson strong coupling constant, script c sign, are computed at one-loop and the strong decay rates of the Δ, Σ* and Ξ* allow us to determine |script c sign| = 1.2±0.1 and script K = -2.2±0.6, in remarkable agreement with predictions based on spin-flavour symmetry. We calculate the Δ pole graph contribution to the polarisability of the nucleon to order 1/Λχ2 in chiral perturbation theory.}, Key = {Butler93b} } @booklet{Butler93a, Author = {Butler, MN and Savage, MJ and Springer, RP}, Title = {Probing hadronic structure with the decay Nl+l-}, Journal = {Physical Review C - Nuclear Physics}, Volume = {48}, Number = {2}, Pages = {917-919}, Year = {1993}, ISSN = {0556-2813}, url = {http://dx.doi.org/10.1103/PhysRevC.48.917}, Abstract = {We compute the branching ratio for Ne+e- and N+- in chiral perturbation theory and find that both decays should be observable at the Continuous Electron Beam Accelerator Facility. With sufficiently low thresholds on the e+e- invariant mass a branching ratio of 10-5 may be observed for Ne+e-. For the N+- decay mode we predict a branching ratio of 3×10-7. The dependence of the M1 and E2 amplitudes on the momentum transfer will provide a useful test of chiral perturbation theory which predicts 20% variation over the allowed kinematic range. © 1993 The American Physical Society.}, Doi = {10.1103/PhysRevC.48.917}, Key = {Butler93a} } @booklet{Butler93c, Author = {Butler, MN and Savage, MJ and Springer, RP}, Title = {E2/M1 mixing ratio of Δ→Nγ and hyperon resonance radiative decay}, Journal = {Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics}, Volume = {304}, Number = {3-4}, Pages = {353-358}, Year = {1993}, Abstract = {We complete the leading contribution to the E2/M1 mixing ratio of the decay Δ→Nγ in heavy baryon chiral perturbation theory. We find the mixing ratio to be 4%≲|δE2/M1|≲11%, much larger than estimates based on the quark model and other hadronic models. We also compute the mixing ratio for the radiative decay of the hyperon resonances. The decays Σ*+→Σ+γ and Ξ*-→Ξ-γ provide a particularly sensitive probe of deviations from heavy baryon spin-flavour SU(6).}, Key = {Butler93c} } @booklet{Savage91, Author = {Savage, MJ and Springer, RP}, Title = {Very charming baryons}, Journal = {International Journal Of Modern Physics A}, Volume = {6}, Number = {10}, Pages = {1701-1712}, Year = {1991}, Month = {April}, Key = {Savage91} } @article{fds248397, Author = {Dai, J and Savage, MJ and Liu, J and Springer, R}, Title = {Low energy effective hamiltonian for ΔI = 1 nuclear parity violation and nucleonic strangeness}, Journal = {Physics Letters B}, Volume = {271}, Number = {3-4}, Pages = {403-409}, Year = {1991}, ISSN = {0370-2693}, url = {http://dx.doi.org/10.1016/0370-2693(91)90108-3}, Abstract = {We calculate the low energy effective hamiltonian for isovector (ΔI = 1) nuclear parity violation, including the effects of heavy quarks s, c and b. At the hadronic scale, the hamiltonian contains four-quark operators of the u, d, and s quarks whose coefficients contain leading logarithmic QCD corrections from running between the weak scale and the hadronic scale. The coefficients of the operators involving the s quark are substantially larger than those of the operators involving only the u and d quarks. Recent EMC measurements of the spin-dependent proton structure functions g1p (x) and measurements of the low-Q2 axial nucleon-Z0 coupling from neutrino scattering indicate that the nucleon matrix element of the strange vector axial current is substantial. Assumming that the weak amplitude factorizes, this matrix element gives rise to an enhancement in the weak isovector parity violating NNρ{variant} coupling, and consequently an enhancement of hρ{variant}1. © 1991.}, Doi = {10.1016/0370-2693(91)90108-3}, Key = {fds248397} } @article{fds248398, Author = {Grinstein, B and Springer, R and Wise, MB}, Title = {Strong-interaction effects in weak radiative B̄-meson decay}, Journal = {Nuclear Physics B}, Volume = {339}, Number = {2}, Pages = {269-309}, Year = {1990}, Abstract = {Strong-interaction corrections to the effective hamiltonian for weak radiative B̄-meson decay (i.e., B̄ → Xs-γ, where Xs denotes a strange hadronic final state) are calculated using the leading logarithmic approximation. The inclusive rate for decays B̄ → Xsγ, where the energy of the photon is large, is computed in the standard model with minimal particle content and in extensions of the minimal standard model with two Higgs doublets.}, Key = {fds248398} } @booklet{Savage90, Author = {Savage, MJ and Springer, RP}, Title = {SU(3) predictions for charmed-baryon decays}, Journal = {Physical Review D: Particles, Fields, Gravitation and Cosmology}, Volume = {42}, Number = {5}, Pages = {1527-1543}, Year = {1990}, ISSN = {0556-2821}, url = {http://dx.doi.org/10.1103/PhysRevD.42.1527}, Abstract = {The charmed baryons c+, źc1+, źc10 and ©c0 can only weakly decay to lower-mass baryons and mesons. We derive relations between the decay rates of these particles based on flavor SU(3). Two-body and three-body nonleptonic decays are explored along with semileptonic decays. © 1990 The American Physical Society.}, Doi = {10.1103/PhysRevD.42.1527}, Key = {Savage90} } @article{fds248396, Author = {Grinstein, B and Springer, R and Wise, MB}, Title = {Effective hamiltonian for weak radiative B-meson decay}, Journal = {Physics Letters B}, Volume = {202}, Number = {1}, Pages = {138-144}, Year = {1988}, ISSN = {0370-2693}, url = {http://dx.doi.org/10.1016/0370-2693(88)90868-4}, Abstract = {The inclusive rate for decay of a B-meson to a hard photon and strange hadronic final states (i.e., B→γXs with Xs=K*, etc.), is likely to be dominated by short-distance physics which gives rise to an effective hamiltonian that is a magnetic-moment-type operator. Strong interaction corrections to this hamiltonian are computed in the leading logarithmic approximation. © 1988.}, Doi = {10.1016/0370-2693(88)90868-4}, Key = {fds248396} } @article{fds221147, Author = {A. Margaryan and R. Springer}, Title = {Using the decay Y(4160) -> X(3872) + photon to probe the molecular content of the X(3872)}, Journal = {Phys Rev. D.}, Volume = {88}, Pages = {014017}, url = {http://dx.doi.org/10.1103/PhysRevD.88.014017}, Doi = {10.1103/PhysRevD.88.014017}, Key = {fds221147} } %% Preprints @article{fds17515, Author = {D. Egolf and R. Springer}, Title = {SU(3) predictions for weak decays of doubly heavy baryons}, Journal = {DUKE-TH-00-207}, Year = {2000}, Key = {fds17515} } %% Other @misc{fds221149, Author = {M. Ahmed and A. Champagne and B. Holstein and C. Howell and M. Snow and R. Springer and Y. Wu}, Title = {Parity Violation in Photonuclear Reactions at HIGS – Submission to Snowmass 2013: Intensity Frontier, arXiv:1307.8178}, Year = {2013}, Month = {July}, Key = {fds221149} } @misc{fds212338, Author = {H. Gao and S.S. Jawalker and M.R. Schindler and W.M. Snow and R. Springer and Y. Wu}, Title = {Parity Violation in Photonuclear Reactions at HIGS}, Year = {2012}, url = {http://www.phy.ornl.gov/funsym/positions/parityviolationatHIGS.pdf}, Key = {fds212338} } @misc{fds212339, Author = {M.W. Ahmed and A.E. Champagne and C.R. Howell and W.M. Snow and R.P. Springer and Y. Wu}, Title = {HIGS2: The Next Generation Compton $\gamma$-ray Source}, Year = {2012}, url = {http://www.tunl.duke.edu/documents/public/higs2_prospectus_31aug2012.pdf}, Key = {fds212339} } @misc{fds17514, Author = {R. Springer}, Title = {Hyperons and Hypernuclei}, Booktitle = {Chiral Dynamics, Newport News, VA}, Year = {2000}, Key = {fds17514} }