Radiative corrections to K_{l3} decays
High Energy Physics - Phenomenology
2008-11-26 v1
Abstract
We present a complete calculation of the K_{l3} decays K^+ --> pi^0 l^+ nu_l and K^0 --> pi^- l^+ nu_l to O(p^4, (m_d-m_u) p^2, e^2 p^2) in chiral perturbation theory with virtual photons and leptons. We introduce the concept of generalized form factors and kinematical densities in the presence of electromagnetism, and propose a possible treatment of the real photon emission in K^+_{l3} decays. We illustrate our results by applying them to the extraction of the Kobayashi--Maskawa matrix element |V_{us}| from the experimental K^+_{e3} decay parameters.
Cite
@article{arxiv.hep-ph/0110153,
title = {Radiative corrections to K_{l3} decays},
author = {V. Cirigliano and M. Knecht and H. Neufeld and H. Rupertsberger and P. Talavera},
journal= {arXiv preprint arXiv:hep-ph/0110153},
year = {2008}
}
Comments
13 pages