The Effective Chiral Lagrangian From the Theta Term
High Energy Physics - Phenomenology
2014-11-20 v2 Nuclear Theory
Abstract
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.
Cite
@article{arxiv.1002.2391,
title = {The Effective Chiral Lagrangian From the Theta Term},
author = {E. Mereghetti and W. H. Hockings and U. van Kolck},
journal= {arXiv preprint arXiv:1002.2391},
year = {2014}
}
Comments
57 pages