Regular Article - Theoretical Physics
Soft-photon corrections in multi-body meson decays
INFN, Laboratori Nazionali di Frascati, via E. Fermi 40, 00044, Frascati, Italy
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Revised: 7 November 2007
Published online: 18 December 2007
The effects due to soft-photon emission (and the related virtual corrections) in multi-body decays of B, D, and K mesons are analyzed. We present analytic expressions for the universal correction factors which can be applied to all multi-body decay modes where a tight soft-photon energy cut in the decaying-particle rest frame is applied. All-order resummations valid in the limit of small and large velocities of the final-state particles are also discussed. The phenomenological implications of these correction factors in the distortion of Dalitz plot distributions of K→3π decays are briefly analyzed.
© Springer-Verlag , 2008