Search for the Rare Leptonic Decays \boldmath{\Blnu} ($\ell=e,μ$)

Details Search for the Rare Leptonic Decays \boldmath{\Blnu} ($\ell=e,μ$) Search for the Rare Leptonic Decays \boldmath{\Blnu} ($\ell=e,μ$)

2009-03-06

arxiv.org/abs/0903.1220v2

Phys.Rev.D79:091101,2009

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages, 4 figures

Scientific paper

10.1103/PhysRevD.79.091101

We 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.

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