Model-independent results for the decay B+ -> l+ nu gamma at BABAR

Details Model-independent results for the decay B+ -> l+ nu gamma at BABAR Model-independent results for the decay B+ -> l+ nu gamma at BABAR

2009-09-30

arxiv.org/abs/0909.5689v1

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 14 figures, To be published in the proceedings of DPF-2009, Detroit, MI, July 2009, eConf C090726

Scientific paper

We present a search for the radiative leptonic decays B+ -> e+ nu gamma and B+ -> mu+ nu gamma using data collected by the BABAR detector at the PEP-II B factory. We fully reconstruct the hadronic decay of one of the B mesons in Upsilon(4S) -> B+B- and then search for evidence of the signal decay within the rest of the event. This method provides clean kinematic information on the signal's missing energy and high momentum photon and lepton, and allows for a model-independent analysis of this decay. Using a data sample of 465 million B-meson pairs, we obtain sensitivity to branching fractions of the same order as predicted by the Standard Model. We report a model-independent branching fraction upper limit of BR(B+ -> l+ nu gamma) < 15.6e-6 (l= e or mu) at the 90% confidence level.

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