Eur. Phys. J. C 70, 219-231 (2010)
https://doi.org/10.1140/epjc/s10052-010-1442-z

Radiative corrections in K→π ℓ ⁺ ℓ ⁻ decays

Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn, 53115, Bonn, Germany

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Received: 13 July 2010
Published online: 30 September 2010

Abstract

We calculate radiative corrections to the flavor-changing neutral current process K→π ℓ ⁺ ℓ ⁻, both for charged and neutral kaon decays. While the soft-photon approximation is shown to work well for the muon channels, we discuss the necessity of further phase space cuts with electrons in the final state. It is also shown how to transfer our results to other decays such as η→γ ℓ ⁺ ℓ ⁻ or ω→π ⁰ ℓ ⁺ ℓ ⁻.