English

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.

Keywords

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

R2 v1 2026-07-22T13:36:44.983Z