Research Interests for Thomas C. Mehen

Research Interests: Theoretical Nuclear and Particle Physics

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 Papers, Books and Preprints (search)
  1. Fleming, S; Makris, Y; Mehen, T, An effective field theory approach to quarkonium at small transverse momentum, Journal of High Energy Physics, vol. 2020 no. 4 (April, 2020) [arXiv:1910.03586], [doi][abs] .
  2. Dai, L; Guo, FK; Mehen, T, Revisiting X (3872) →d0 D 0π0 in an effective field theory for the X (3872) Revisiting X (3872) →d0 D 0π0 in An Effective Field ... Dai Lin, Guo Feng-Kun, and Mehen Thomas, Physical Review D, vol. 101 no. 5 (March, 2020) [doi][abs] .
  3. Mehen, T; Mohapatra, A, Perturbative corrections to heavy quark-diquark symmetry predictions for doubly heavy baryon hyperfine splittings, Physical Review D, vol. 100 no. 7 (October, 2019) [doi][abs] .
  4. Yao, X; Mehen, T, Quarkonium in-medium transport equation derived from first principles, Physical Review D, vol. 99 no. 9 (May, 2019) [doi][abs] .
  5. Mehen, T; Mohapatra, A, Doubly heavy baryons and corrections to heavy quark-diquark symmetry prediction for hyperfine splitting, Proceedings of the 2019 Meeting of the Division of Particles and Fields of the American Physical Society, Dpf 2019 (January, 2019)[abs] .

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