Electromagnetic corrections in hadronic processes

Details Electromagnetic corrections in hadronic processes Electromagnetic corrections in hadronic processes

2003-05-23

arxiv.org/abs/hep-ph/0305260v2

Eur.Phys.J. C32 (2003) 97-114

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages (LaTex), 5 figures, published version. References in the introduction added, discussion shortened, 1 figure removed,

Scientific paper

10.1140/epjc/s2003-01383-1

In quantum field theory, the splitting of the Hamiltonian into a strong and an electromagnetic part cannot be performed in a unique manner. We propose a convention for disentangling these two effects: one matches the parameters of two theories -- with and without electromagnetic interactions -- at a given scale mu_1, referred to as the matching scale. This procedure enables one to analyze the separation of strong and electromagnetic contributions in a transparent manner. We illustrate the method -- in the framework of the loop expansion -- in a Yukawa model, as well as in the linear sigma model, where we also investigate the corresponding low-energy effective theory.

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