A Search for B→ τν
Browder, T. E. · Collaboration, CLEO
Original · EN
We report results of a search for B→τν in a sample of 9.7 million charged B meson decays. The search uses both πν and ℓνν decay modes of the τ, and demands exclusive reconstruction of the companion B decay to suppress background. We set an upper limit on the branching fraction B(B→ τν) < 8.4× 10⁻⁴ at 90% confidence level. With slight modification to the analysis we also establish B(B±→ K±νν) < 2.4× 10⁻⁴ at 90% confidence level.
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