The Effective Chiral Lagrangian From the Theta Term

Details The Effective Chiral Lagrangian From the Theta Term The Effective Chiral Lagrangian From the Theta Term

2010-02-11

arxiv.org/abs/1002.2391v2

Annals of Physics, Volume 325, Issue 11, November 2010, pages 2363-2409

Physics

High Energy Physics

High Energy Physics - Phenomenology

57 pages

Scientific paper

10.1016/j.aop.2010.03.005

We construct the effective chiral Lagrangian involving hadronic and electromagnetic interactions originating from the QCD theta term. We impose vacuum alignment at both quark and hadronic levels, including field redefinitions to eliminate pion tadpoles. We show that leading time-reversal-violating (TV) hadronic interactions are related to isospin-violating interactions that can in principle be determined from charge-symmetry-breaking experiments. We discuss the complications that arise from TV electromagnetic interactions. Some implications of the expected sizes of various pion-nucleon TV interactions are presented, and the pion-nucleon form factor is used as an example.

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