Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-11-25
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 latex pages, Talk given at SIGHAD2003, Pisa (Italy), October 8-10, 2003
Scientific paper
10.1016/S0920-5632(04)00022-2
The inclusion of electromagnetism in a low energy effective theory is worth further study in view of the present high precision experiments (muon g-2, pi_0->2 gamma, tau decays, etc.). In particular in many applications of chiral perturbation theory, one has to purify physical matrix elements from electromagnetic effects. The theoretical problems that I want to point out here are following: the splitting of a pure QCD and a pure electromagnetic part in a hadronic process is model dependent: is it possible to parametrise in a clear way this splitting? What kind of information (scale dependence, gauge dependence,..) is actually included in the parameters of the low energy effective theory? I will attempt to answer these questions introducing a possible convention to perform the splitting between strong and electromagnetic parts in some examples.
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