Search for the Rare Leptonic Decay B- -> tau- nubar

Details Search for the Rare Leptonic Decay B- -> tau- nubar Search for the Rare Leptonic Decay B- -> tau- nubar

2004-07-21

arxiv.org/abs/hep-ex/0407038v1

Phys.Rev.Lett.95:041804,2005

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 2 figures, Submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.95.041804

We present a search for the decay $B^{-} \to \tau^{-} \bar{\nu}_{\tau}$ in a sample of $88.9 \times 10^{6}$ $B\bar{B}$ pairs recorded with the BaBar detector at the SLAC $B$-Factory. One of the two $B$ mesons from the $\Upsilon(4S)$ is reconstructed in a hadronic or a semileptonic final state and the decay products of the other $B$ in the event are analyzed for consistency with a $B^{-} \to \tau^{-} \bar{\nu}_{\tau}$ decay. We find no evidence of a signal and set an upper limit on the branching fraction of $\mathcal{B}(B^{-} \to \tau^{-} \bar{\nu}_{\tau}) < 4.2 \times 10^{-4}$ at the 90% confidence level.

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