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Search for the rare leptonic decays B+ -> l(+) nu(l) (l = e, mu)

AuthorsBabar Collaboration; Azzolini, Virginia; López-March, Neus ; Martínez-Vidal, Fernando ; Milanés, Diego A. ; Oyanguren, Arantza ; Aubert, B.
Issue Date28-May-2009
PublisherAmerican Physical Society
CitationPhysical Review - Section D - Particles and Fields 79 (9): 091101(2009)
AbstractWe have performed a search for the rare leptonic decays \Bp \to \ellp \nul ($l=e,\mu$), using data collected at the \FourS resonance by the \babar\ detector at the \pep2 storage ring. In a sample of 468 million \BB pairs we find no evidence for a signal and set an upper limit on the branching fractions $\BR(\bmunu) < 1.0\times10^{-6}$ and $\BR(\benu) < 1.9\times10^{-6}$ at the 90% confidence level, using a Bayesian approach.
Publisher version (URL)http://dx.doi.org/ 10.1103/PhysRevD.79.091101
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