A Search for $B\to τν$

Details A Search for $B\to τν$ A Search for $B\to τν$

2000-07-27

arxiv.org/abs/hep-ex/0007057v1

Phys.Rev.Lett.86:2950-2954,2001

Physics

High Energy Physics

High Energy Physics - Experiment

10 ages postscript, also available through http://w4.lns.cornell.edu/public/CLNS

Scientific paper

10.1103/PhysRevLett.86.2950

We report results of a search for $B\to\tau\nu$ in a sample of 9.7 million charged $B$ meson decays. The search uses both $\pi\nu$ and $\ell\nu\bar\nu$ decay modes of the $\tau$, and demands exclusive reconstruction of the companion $\bar B$ decay to suppress background. We set an upper limit on the branching fraction ${\cal B}(B\to \tau\nu) < 8.4\times 10^{-4}$ at 90% confidence level. With slight modification to the analysis we also establish ${\cal B}(B^\pm\to K^\pm\nu\bar\nu) < 2.4\times 10^{-4}$ at 90% confidence level.

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