A search for the decays $B^+\to e^+ ν_e$ and $B^+\to μ^+ ν_μ$ using hadronic-tag reconstruction

Details A search for the decays $B^+\to e^+ ν_e$ and $B^+\to μ^+ ν_μ$ using hadronic-tag reconstruction A search for the decays $B^+\to e^+ ν_e$ and $B^+\to μ^+ ν_μ$ using hadronic-tag reconstruction

2006-07-31

arxiv.org/abs/hep-ex/0607110v1

Physics

High Energy Physics

High Energy Physics - Experiment

19 pages, 11 figures, submitted to ICHEP2006

Scientific paper

We report on a search for the rare decay modes $B^+\to e^+ \nu_e$ and $B^+\to \mu^+ \nu_\mu$ with data collected from the BaBar detector at the PEP-II $e^+e^-$ storage ring. This search utilizes a new technique in which we fully reconstruct the accompanying $B^-$ in $\Upsilon(4S)\righarrow B^+ B^-$ events, and look for a mono-energetic lepton in the $B^+$ rest frame. No signal candidates are observed in either of the channels, consistent with the expected background, in a data sample of approximately 229 million $B\bar{B}$ pairs. The branching-fraction upper limits are set at $\mathcal{B}(B^+\to e^+\nu_{e})<7.9 \times 10^{-6}$ and $\mathcal{B}(B^+\to\mu^+\nu_{\mu})<6.2 \times 10^{-6}$ at the 90% confidence level.

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