Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-07-10
Phys.Lett.B681:257-263,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 3 figures
Scientific paper
10.1016/j.physletb.2009.10.017
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.
Becirevic Damir
Haas Benjamin
Kou Emi
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