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- W2009553617 abstract "We present a search for the decay B+→τ+ν using 467.8×106 BB¯ pairs collected at the Υ(4S) resonance with the BABAR detector at the SLAC PEP-II B-Factory. We select a sample of events with one completely reconstructed B− in the hadronic decay mode (B−→D(*)0X− and B−→J/ψX−). We examine the rest of the event to search for a B+→τ+ν decay. We identify the τ+ lepton in the following modes: τ+→e+νν¯, τ+→μ+νν¯, τ+→π+ν¯ and τ+→ρ+ν¯. We find an excess of events with respect to the expected background, which excludes the null signal hypothesis at the level of 3.8σ (including systematic uncertainties) and corresponds to a branching fraction value of B(B+→τ+ν)=(1.83−0.49+0.53(stat)±0.24(syst))×10−4.Received 8 July 2012DOI:https://doi.org/10.1103/PhysRevD.88.031102© 2013 American Physical Society" @default.
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