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Article Dans Une Revue Physics Letters B Année : 2009

Soft Photon Problem in Leptonic B-decays

Résumé

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.

Dates et versions

hal-00419182 , version 1 (22-09-2009)

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Damir Becirevic, Benjamin Haas, Emi Kou. Soft Photon Problem in Leptonic B-decays. Physics Letters B, 2009, 681, pp.257-263. ⟨10.1016/j.physletb.2009.10.017⟩. ⟨hal-00419182⟩
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