Radiative corrections to K_{l3} decays

Details Radiative corrections to K_{l3} decays Radiative corrections to K_{l3} decays

2001-10-11

arxiv.org/abs/hep-ph/0110153v1

Eur.Phys.J.C23:121-133,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages

Scientific paper

10.1007/s100520100825

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.

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