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Search for B++ν recoiling against BD0ν¯X

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. D 81, 051101(R) – Published 30 March 2010

Abstract

We present a search for the decay B++ν(=τ,μ,ore) in (458.9±5.1)×106 BB¯ pairs recorded with the BABAR detector at the PEP-II B-factory. We search for these B decays in a sample of B+B events where one B-meson is reconstructed as BD0ν¯X. Using the method of Feldman and Cousins, we obtain B(B+τ+ντ)=(1.7±0.8±0.2)×104, which excludes zero at 2.3σ. We interpret the central value in the context of the standard model and find the B meson decay constant to be fB2=(62±31)×103MeV2. We find no evidence for B+e+νe and B+μ+νμ and set upper limits at the 90% C.L. B(B+e+νe)<0.8×105 and B(B+μ+νμ)<1.1×105.

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  • Received 14 December 2009

DOI:https://doi.org/10.1103/PhysRevD.81.051101

©2010 American Physical Society

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Vol. 81, Iss. 5 — 1 March 2010

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