Model-independent Search for the Decayb+→l+νlγ

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Physical review D Particles, fields, gravitation, and cosmology/Physical review D, Particles, fields, gravitation, and cosmology（2009）

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摘要

We present a search for the radiative leptonic decay B+-> l(+)nu(l)gamma, where l=e, mu, using a data sample of 465x10(6) BB pairs collected by the BABAR experiment. In this analysis, we fully reconstruct the hadronic decay of one of the B mesons in Upsilon(4S)-> B+B- decays, then search for evidence of B+-> l(+)nu(l)gamma in the rest of the event. We observe no significant evidence of signal decays and report model-independent branching fraction upper limits of B(B+-> e(+)nu(e)gamma)< 17x10(-6), B(B+->mu(+)nu(mu)gamma)< 24x10(-6), and B(B+-> l(+)nu(l)gamma)< 15.6x10(-6) (l=e or mu), all at the 90% confidence level.

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