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Search for B+-->[script l]+ν[script l] recoiling against B -->D0[script l]- [v over-bar]X

Author(s)
Dujmic, Denis; Henderson, Shawn Wesley; Sciolla, Gabriella; Zhao, M.; Cowan, Ray F; Fisher, Peter H; Spitznagel, Michael A; Yamamoto, R. K.; ... Show more Show less
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Alternative title
Search for B+→ℓ+νℓ recoiling against B-→D0ℓ-ν̅ X
Terms of use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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Abstract
We present a search for the decay B+→ℓ+νℓ(ℓ=τ,μ, or e) in (458.9±5.1)×106 BB̅ 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 B-→D0ℓ-ν̅ X. Using the method of Feldman and Cousins, we obtain B(B+→τ+ντ)=(1.7±0.8±0.2)×10-4, 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)×103  MeV2. 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)<0.8×10-5 and B(B+→μ+νμ)<1.1×10-5.
Date issued
2010-03
URI
http://hdl.handle.net/1721.1/58979
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical review D
Publisher
American Physical Society
Citation
B. Aubert et al. (2010). Search for B+→ℓ+νℓ recoiling against B-→D0ℓ-ν̅ X. Phys. rev. D 81: 051101/1-9. © 2010 The American Physical Society
Version: Final published version
ISSN
1550-7998
1550-2368

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