We present searches for the leptonic decays B+→ℓ+ν and the lepton flavor violating decays B0→ℓ±τ, where ℓ=e, μ, with data collected by the BABAR experiment at SLAC. This search demonstrates a novel technique in which we fully reconstruct the accompanying B̄ in Υ(4S)→BB̄ events, and look for a monoenergetic lepton from the signal B decay. The signal yield is extracted from a fit to the signal lepton candidate momentum distribution in the signal B rest frame. Using a data sample of approximately 378×106 BB̄ pairs (342fb-1), we find no evidence of signal in any of the decay modes. Branching fraction upper limits of B(B+→e+ν)<5.2×10-6, B(B+→μ+ν)<5.6×10-6, B(B0→e+τ-)<2.8×10-5 and B(B0→μ+τ-)<2. 2×10-5, are obtained at 90% confidence level.

Aubert, B., Bona, M., Karyotakis, Y., Lees, J., Poireau, V., Prudent, X., et al. (2008). Searches for the decays B0→l±τ... and B+→l+ν (l=e, μ) using hadronic tag reconstruction. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 77(9) [10.1103/PhysRevD.77.091104].

Searches for the decays B0→l±τ... and B+→l+ν (l=e, μ) using hadronic tag reconstruction

CARPINELLI, Massimo;
2008

Abstract

We present searches for the leptonic decays B+→ℓ+ν and the lepton flavor violating decays B0→ℓ±τ, where ℓ=e, μ, with data collected by the BABAR experiment at SLAC. This search demonstrates a novel technique in which we fully reconstruct the accompanying B̄ in Υ(4S)→BB̄ events, and look for a monoenergetic lepton from the signal B decay. The signal yield is extracted from a fit to the signal lepton candidate momentum distribution in the signal B rest frame. Using a data sample of approximately 378×106 BB̄ pairs (342fb-1), we find no evidence of signal in any of the decay modes. Branching fraction upper limits of B(B+→e+ν)<5.2×10-6, B(B+→μ+ν)<5.6×10-6, B(B0→e+τ-)<2.8×10-5 and B(B0→μ+τ-)<2. 2×10-5, are obtained at 90% confidence level.
Articolo in rivista - Articolo scientifico
BABAR experiment
English
B. Aubert et al. (BABAR Collaboration)
Aubert, B., Bona, M., Karyotakis, Y., Lees, J., Poireau, V., Prudent, X., et al. (2008). Searches for the decays B0→l±τ... and B+→l+ν (l=e, μ) using hadronic tag reconstruction. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 77(9) [10.1103/PhysRevD.77.091104].
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