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Search for B+→ℓ+νℓ recoiling against B−→D0ℓ−ν[bar]X

We present a search for the decay B+→ℓ+νℓ(ℓ=τ,μ, or e) in (458.9±5.1)×106 BB[bar] 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−¯νX. Using the method of Feldman and Cousins, we obta...

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Hauptverfasser: Aubert, Bernard (VerfasserIn) , Marks, Jörg (VerfasserIn) , Schenk, Sebastian (VerfasserIn) , Uwer, Ulrich (VerfasserIn)
Körperschaft: BABAR Collaboration (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 30 March 2010
In: Physical review. D, Particles, fields, gravitation, and cosmology
Year: 2010, Jahrgang: 81, Heft: 5, Pages: 1-9
ISSN:1550-2368
DOI:10.1103/PhysRevD.81.051101
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevD.81.051101
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.81.051101
Volltext
Verfasserangaben:BABAR Collaboration*

MARC

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520 |a We present a search for the decay B+→ℓ+νℓ(ℓ=τ,μ, or e) in (458.9±5.1)×106 BB[bar] 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−¯νX. 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 f2B=(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. 
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