A search for the decay of the positive B meson into a positive tau lepton and a tau neutrino at the BaBar experiment

Details A search for the decay of the positive B meson into a positive tau lepton and a tau neutrino at the BaBar experiment A search for the decay of the positive B meson into a positive tau lepton and a tau neutrino at the BaBar experiment

2006-11-10

arxiv.org/abs/hep-ex/0611019v1

Nucl.Phys.Proc.Suppl.169:70-75,2007

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 3 figures, contribution to the Proceedings of The 9th International Workshop on Tau Lepton Physics, Pisa, Italy, 2006

Scientific paper

10.1016/j.nuclphysbps.2007.02.10

We present a search for the decay B+ -> tau+ nu using 288 inverse femtobarns of data collected at the Upsilon(4S) resonance with the BaBar detector at the SLAC PEP-II B-Factory. A sample of events with one reconstructed semileptonic B decay (B- -> D0 l- nu X) is selected, and in the recoil a search for the signal decay mode is performed. The tau is identified in four channels. We measure a branching fraction of BF(B+ -> tau+ nu) = (0.88+0.68 -0.67(stat.) +- 0.11(syst.)) x 10^{-4} and extract an upper limit on the branching fraction, at the 90% confdence level, of 1.8 x 10^{-4}.

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