# A search for the decays $B^+\to e^+ \nu_e$ and $B^+\to \mu^+ \nu_\mu$ using hadronic-tag reconstruction

Abstract : 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.
Document type :
Conference papers

http://hal.in2p3.fr/in2p3-00117358
Contributor : Dominique Girod <>
Submitted on : Friday, December 1, 2006 - 1:41:56 PM
Last modification on : Sunday, June 20, 2021 - 3:35:08 AM

### Citation

B. Aubert, R. Barate, M. Bona, D. Boutigny, F. Couderc, et al.. A search for the decays $B^+\to e^+ \nu_e$ and $B^+\to \mu^+ \nu_\mu$ using hadronic-tag reconstruction. 33rd International Conference on High-Energy Physics, ICHEP 06, Jul 2006, Moscou, Russia. ⟨in2p3-00117358⟩

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