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arXiv · 0807.0515

Radiative corrections in K --> 3 pi decays

M. Bissegger·A. Fuhrer·J. Gasser·B. Kubis·A. Rusetsky
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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.

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M. Bissegger, A. Fuhrer, J. Gasser, B. Kubis, A. Rusetsky. 2008-07-03. Radiative corrections in K --> 3 pi decays. https://doi.org/10.1016/j.nuclphysb.2008.07.027

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