Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-08-26
PiN Newslett.15:132-135,1999
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, talk given at MENU99, 18th International Symposium on Meson-Nucleon Physics and the Structure of the Nucleon, Zuoz, A
Scientific paper
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 ($\pi_0 - \eta$ 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.
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