Electromagnetic corrections in hadronic processes
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.
Cite
@article{arxiv.hep-ph/0305260,
title = {Electromagnetic corrections in hadronic processes},
author = {J. Gasser and A. Rusetsky and I. Scimemi},
journal= {arXiv preprint arXiv:hep-ph/0305260},
year = {2009}
}
Comments
19 pages (LaTex), 5 figures, published version. References in the introduction added, discussion shortened, 1 figure removed, conclusions unchanged