Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-06-16
Nucl.Phys. A629 (1998) 72c-81c
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pp, LaTeX file, 3 figures, uses espcrc1.sty and epsf, plenary talk, QULEN '97, Osaka, May 1997, to be published in the proc
Scientific paper
10.1016/S0375-9474(97)00668-4
I discuss recent progress made in calculating electromagnetic corrections in the framework of the effective field theory of QCD. In the case of elastic pion-pion scattering, strong interaction predictions have been worked out to two loop accuracy. I present first results for the electromagnetic corrections in the case of neutral pions. Here, the only sizeable effect comes from the charged to neutral pion mass difference. In the presence of nucleons, isospin violation can be measured in threshold pion photoproduction. I review the present status of the theoretical predictions and the experimental data. I argue that a deeper understanding of isospin violation based on a more precise study of such reactions can be achieved.
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