**Office Location:** 249 Physics Bldg, Durham, NC 27708**Office Phone:** (919) 660-2555**Email Address:** mehen@phy.duke.edu**Web Page:** http://www.phy.duke.edu/~mehen

**Specialties:**

Theoretical particle physics and string theory

Theoretical nuclear physics

**Education:**

Ph.D., Johns Hopkins University, 1998

Ph.D., Johns Hopkins University, 1997

M.A., Johns Hopkins University, 1997

B.S., University of Virginia, 1992

**Research Categories:** *Theoretical Nuclear and Particle Physics*

**Research Description:** Prof. Thomas Mehen works primarily on Quantum Chromodynamics (QCD) and
the application of effective field theory to problems in hadronic physics.
Effective field theories exploit the symmetries of hadrons to make model
independent predictions when the dynamics of these hadrons are too hard to
solve explicitly. For example, the properties of a hadron containing a
very heavy quark are insensitive to the orientation of the heavy quark
spin. Prof. Mehen has used this heavy quark spin symmetry to make
predictions for the production and decay of heavy mesons and quarkonia at
collider experiments. Another example is the chiral symmetry of QCD which
is a consequence of the lightness of the up and down quarks. The
implications of this symmetry for the force between nucleons is a subject
of Prof. Mehen's research. Prof. Mehen has also worked on effective field
theory for nonrelativistic particles whose short range interactions are
characterized by a large scattering length. This theory has been
successfully applied to low energy two- and three-body nuclear processes.
Some of Prof. Mehen's work is interdisciplinary. For example, techniques
developed for nuclear physics have been used to calculate three-body
corrections to the energy density of a Bose-Einstein condensate whose
atoms have large scattering lengths. Prof. Mehen has also worked on novel
field theories which arise from unusual limits of string theory. Examples
include noncommutative field theories and theories of tachyonic modes on
non-BPS branes.

**Recent Publications**
(More Publications)
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- Mehen, T,
*Hadronic loops versus factorization in effective field theory calculations of*, Physical Review D - Particles, Fields, Gravitation, and Cosmology, vol. 92 no. 3 (August, 2015) [doi] . - Baumgart, M; Leibovich, AK; Mehen, T; Rothstein, IZ,
*Probing quarkonium production mechanisms with jet substructure*, The Journal of High Energy Physics, vol. 2014 no. 11 (November, 2014) [2295], [doi] . - Kim, C; Idilbi, A; Mehen, T; Yoon, YW,
*Production of stoponium at the LHC*, Physical Review D - Particles, Fields, Gravitation, and Cosmology, vol. 89 no. 7 (April, 2014) [1284], [doi] . - Thomas Mehen,
*Exotic Quarkonium Spectroscopy: X(3872) Z(10610) Z(10650) in Non-Relativistic Effective Theory*, Conference Proeceedings for PhiPsi 2013, Rome, Italy, September 11, 2013 (Accepted, 2013) . - Thomas Mehen and Joshua W. Powell,
*Line shapes in Υ(5S)→B*, Phys. Rev. D88:034017 (2013) [5459] .^{(∗)}B^{(∗)}π with Z(10610) and Z(10650) using effective field theory

**Highlight:**

Prof. Thomas Mehen works primarily on Quantum Chromodynamics (QCD) and
the application of effective field theory to problems in hadronic physics.
Effective field theories exploit the symmetries of hadrons to make model
independent predictions when the dynamics of these hadrons are too hard to
solve explicitly. For example, the properties of a hadron containing a
very heavy quark are insensitive to the orientation of the heavy quark
spin. Prof. Mehen has used this heavy quark spin symmetry to make
predictions for the production and decay of heavy mesons and quarkonia at
collider experiments. Another example is the chiral symmetry of QCD which
is a consequence of the lightness of the up and down quarks. The
implications of this symmetry for the force between nucleons is a subject
of Prof. Mehen's research. Prof. Mehen has also worked on effective field
theory for nonrelativistic particles whose short range interactions are
characterized by a large scattering length. This theory has been
successfully applied to low energy two- and three-body nuclear processes.
Some of Prof. Mehen's work is interdisciplinary. For example, techniques
developed for nuclear physics have been used to calculate three-body
corrections to the energy density of a Bose-Einstein condensate whose
atoms have large scattering lengths. Prof. Mehen has also worked on novel
field theories which arise from unusual limits of string theory. Examples
include noncommutative field theories and theories of tachyonic modes on
non-BPS branes.

**Current Ph.D. Students**(Former Students)- Reggie Bain
- Yiannis Makris
- Dilun Yang
- Jie Hu

**Postdocs Mentored**- Jared Vanasse (2012- present)
- Chul Kim (September 2007 -December 2009)
- Ahmad Idilbi (September, 2006 - February, 2010)
- Brian Tiburzi (September, 2004 - August, 2006)
- Carlos Schat (2002/09-2004/09)