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arXiv · hep-ph/0305260

Electromagnetic corrections in hadronic processes

J. Gasser·A. Rusetsky·I. Scimemi
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Abstract

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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J. Gasser, A. Rusetsky, I. Scimemi. 2003-12-22. Electromagnetic corrections in hadronic processes. https://doi.org/10.1140/epjc%2Fs2003-01383-1

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