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Search for B^{+}→ℓ^{+}ν_{ℓ} recoiling against B^{-}→D^{0}ℓ^{-}ν[over ¯]X

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Aubert, B., Karyotakis, Y., Lees, J. P., Poireau, V., Prencipe, E., Prudent, X., Tisserand, V., Garra Tico, J., Grauges, E., Martinelli, M. et al.
. (2010) Search for B^{+}→ℓ^{+}ν_{ℓ} recoiling against B^{-}→D^{0}ℓ^{-}ν[over ¯]X. Physical Review D (Particles, Fields, Gravitation and Cosmology), Vol.81 (No.5). article no. 051101(R). ISSN 1550-7998

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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.

Item Type: Journal Article
Divisions: Faculty of Science > Physics
Journal or Publication Title: Physical Review D (Particles, Fields, Gravitation and Cosmology)
Publisher: American Physical Society
ISSN: 1550-7998
Official Date: 2010
Volume: Vol.81
Number: No.5
Number of Pages: 9
Page Range: article no. 051101(R)
Identification Number: 10.1103/PhysRevD.81.051101
Status: Peer Reviewed
Publication Status: Published
URI: http://wrap.warwick.ac.uk/id/eprint/40214

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