Search for B+τ+ν

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. D 76, 052002 – Published 18 September 2007

Abstract

We present a search for the decay B+τ+ν using 383×106BB¯ pairs collected at the Υ(4S) resonance with the BABAR detector at the SLAC PEP-II B-Factory. A sample of events with one reconstructed semileptonic B decay (BD0ν¯X) is selected, and in the recoil a search for B+τ+ν is performed. The τ is identified in the following channels: τ+e+νν¯, τ+μ+νν¯, τ+π+ν¯, and τ+π+π0ν¯. We measure a branching fraction of B(B+τ+ν)=(0.9±0.6(stat.)±0.1(syst.))×104. In the absence of a significant signal, we calculate an upper limit at the 90% confidence level of B(B+τ+ν)<1.7×104. We calculate the product of the B meson decay constant fB and |Vub| to be fB·|Vub|=(7.22.8+2.0(stat.)±0.2(syst.))×104GeV.

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  • Received 14 May 2007

DOI:https://doi.org/10.1103/PhysRevD.76.052002

©2007 American Physical Society

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Vol. 76, Iss. 5 — 1 September 2007

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