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Soft-photon corrections in multi-body meson decays

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Abstract

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 \(\mathcal{O}(\alpha)\) 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.

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Correspondence to G. Isidori.

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Isidori, G. Soft-photon corrections in multi-body meson decays. Eur. Phys. J. C 53, 567–571 (2008). https://doi.org/10.1140/epjc/s10052-007-0487-0

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  • DOI: https://doi.org/10.1140/epjc/s10052-007-0487-0

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