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arxiv: hep-ph/0110153 · v1 · submitted 2001-10-11 · ✦ hep-ph

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Radiative corrections to K_{l3} decays

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classification ✦ hep-ph
keywords decaysapplyingcalculationchiralcompleteconceptcorrectionsdecay
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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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