Radiative corrections in K --> 3 pi decays
Abstract
We investigate radiative corrections to K --> 3 pi decays. In particular, we extend the non-relativistic framework developed recently to include real and virtual photons and show that, in a well-defined power counting scheme, the results reproduce corrections obtained in the relativistic calculation. Real photons are included exactly, beyond the soft-photon approximation, and we compare the result with the latter. The singularities generated by pionium near threshold are investigated, and a region is identified where standard perturbation theory in the fine structure constant alpha may be applied. We expect that the formulae provided allow one to extract S-wave pi pi scattering lengths from the cusp effect in these decays with high precision.
Cite
@article{arxiv.0807.0515,
title = {Radiative corrections in K --> 3 pi decays},
author = {M. Bissegger and A. Fuhrer and J. Gasser and B. Kubis and A. Rusetsky},
journal= {arXiv preprint arXiv:0807.0515},
year = {2008}
}
Comments
57 pages, 17 figures