Virtual photons to fourth order CHPT with nucleons
High Energy Physics - Phenomenology
2011-04-15 v1
Abstract
I discuss the whole mechanism to calculate isospin violation effects in the framework of CHPT. In order to get the correct size of isospin violation one has to include all non-isospin symmetric sources like the electromagnetic interaction, the quark mass difference ( mixing), explicit photon loops. As examples I discuss the electromagnetic contributions to the pion nucleon sigma term and to the S-wave pion nucleon scattering length.
Keywords
Cite
@article{arxiv.hep-ph/9908470,
title = {Virtual photons to fourth order CHPT with nucleons},
author = {Guido Mueller},
journal= {arXiv preprint arXiv:hep-ph/9908470},
year = {2011}
}
Comments
5 pages, talk given at MENU99, 18th International Symposium on Meson-Nucleon Physics and the Structure of the Nucleon, Zuoz, August 15-21,1999