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Persistent URL http://purl.org/net/epubs/work/66479
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Record Id 66479
Title Evidence of B+ -> tau(+)nu decays with hadronic B tags
Abstract We present a search for the decay B+→τ+ν using 467.8×106 BB̅ 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+νν̅ , τ+→μ+νν̅ , τ+→π+ν̅ and τ+→ρ+ν̅ . 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.
Organisation PPD , PPD-BABAR , BABAR , STFC
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Language English (EN)
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Journal Article Phys Rev D 88, no. 3 (2013): 031102. doi:10.1103/PhysRevD.88.031102 2013