Search for B+→ℓ+νℓ recoiling against B-→D0ℓ-ν¯X
Abstract
We present a search for the decay B+→ℓ+νℓ(ℓ=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 B-→D0ℓ-ν¯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)×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)<0.8×10-5 and B(B+→μ+νμ)<1.1×10-5.
- Publication:
-
Physical Review D
- Pub Date:
- March 2010
- DOI:
- 10.1103/PhysRevD.81.051101
- arXiv:
- arXiv:0809.4027
- Bibcode:
- 2010PhRvD..81e1101A
- Keywords:
-
- 13.20.-v;
- 12.15.Ji;
- 13.25.Hw;
- Leptonic semileptonic and radiative decays of mesons;
- Applications of electroweak models to specific processes;
- Decays of bottom mesons;
- High Energy Physics - Experiment
- E-Print:
- 30 pages, 15 postscript figures, submitted to CKM2008