Soft Photon Problem in Leptonic B-decays

Abstract

We point out at the peculiarity of B --> mu nu decay, namely the enhancement of the soft photon events which originate from the structure dependent part of the B --> mu nu gamma amplitude. This may be a dominant source of systematic uncertainty and compromise the projected experimental uncertainty on Gamma(B --> mu nu). We show that the effect of these soft photons can be controlled if the experimental cut on identification of soft photons is lowered and especially if the better resolution in identifying the momentum of muon emerging from B --> mu nu, is made. A lattice QCD computation of the relevant form factors would be highly helpful for a better numerical control over the structure dependent soft photon emission.

16 pages, 3 figures

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• Predictions of selected flavour observables within the Standard Model
• QED Corrections to Hadronic Processes in Lattice QCD
• B meson distribution amplitude from B --> γl ν
• FCNC portals to the dark sector
• One meson radiative tau decays
• The CKM parameters in the SMEFT
• First lattice calculation of radiative leptonic decay rates of pseudoscalar mesons
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• Discerning new physics in charm meson leptonic and semileptonic decays
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