Search for Lepton-Flavor-Violating Decays of B Mesons
K. W. Edwards, et al. (CLEO Collaboration)

TL;DR
This study searched for rare lepton-flavor-violating decays of B mesons in a large dataset but found no evidence, setting upper limits on their branching fractions to constrain new physics models.
Contribution
The paper provides the first comprehensive search for multiple lepton-flavor-violating B meson decays and establishes upper limits on their branching fractions.
Findings
No evidence for lepton-flavor-violating decays was observed.
Upper limits on branching fractions range from 1.0 to 8.3 x 10^{-6}.
Results constrain theories predicting such rare decays.
Abstract
We have searched a sample of 9.6 million BB-bar events for the lepton-flavor-violating decays B --> h e^{+-} mu^{-+}, B^+ --> h^- e^+ e^+, B^+ --> h^- e^+ mu^+, and B^+ --> h^- mu^+ mu^+, where h is pi, K, rho, and K*(892), a total of sixteen modes. We find no evidence for these decays, and place 90% confidence level upper limits on their branching fractions that range from 1.0 to 8.3 X 10^{-6}.
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