# Thomas C. Mehen

## Professor of Physics

### Overview

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.

Lattice and Effective Field Theory Studies of Quantum Chromodynamics awarded by Department of Energy (Co-Principal Investigator). 2005 to 2018

Heavy Quarks, QCD, and Effective Field Theory awarded by Department of Energy (Principal Investigator). 2005 to 2009

Bain, R, Makris, Y, and Mehen, T. "Transverse momentum dependent fragmenting jet functions with applications to quarkonium production." *Journal of High Energy Physics* 2016.11 (November 2016).
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Yao, X, Mehen, T, and Müller, B. "An effective field theory approach to the stabilization of 8 Be in a QED plasma." *Journal of Physics G: Nuclear and Particle Physics* 43.7 (July 1, 2016): 07LT02-07LT02.
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Bain, R, Dai, L, Hornig, A, Leibovich, AK, Makris, Y, and Mehen, T. "Analytic and Monte Carlo studies of jets with heavy mesons and quarkonia." *Journal of High Energy Physics* 2016.6 (June 2016).
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Hornig, A, Makris, Y, and Mehen, T. "Jet shapes in dijet events at the LHC in SCET." *Journal of High Energy Physics* 2016.4 (April 2016).
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Mehen, T. "Hadronic loops versus factorization in effective field theory calculations of." *Physical Review D* 92.3 (August 2015).
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Baumgart, M, Leibovich, AK, Mehen, T, and Rothstein, IZ. "Probing quarkonium production mechanisms with jet substructure." *Journal of High Energy Physics* 2014.11 (November 2014).
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Kim, C, Idilbi, A, Mehen, T, and Yoon, YW. "Production of stoponium at the LHC." *Physical Review D* 89.7 (April 2014).
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Fleming, S, Leibovich, AK, Mehen, T, and Rothstein, IZ. "Anomalous dimensions of the double parton fragmentation functions." *Physical Review D - Particles, Fields, Gravitation and Cosmology* 87.7 (2013).
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Mehen, T, and Powell, JW. "Line shapes in Υ(5S)→B(*)B ̄(*)π with Z(10610) and Z(10650) using effective field theory." *Physical Review D - Particles, Fields, Gravitation and Cosmology* 88.3 (2013).
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Fleming, S, and Mehen, T. "The decay of the X(3872) into &chicJ and the Operator Product Expansion in XEFT." *Phys.Rev. D85:014016* (2012). (Academic Article)

## Pages

Mehen, T. "New tests of NRQCD from Quarkonia within jets." January 1, 2015.