Search for Charged Lepton Flavor Violation in Narrow Υ Decays

Le résumé fourni par la source

Charged-lepton flavor-violating processes are unobservable in the standard model, but they are predicted to be enhanced in several extensions to the standard model, including supersymmetry and models with leptoquarks or compositeness. We present a search for such processes in a sample of $99\ifmmode\times\else\texttimes\fi{}{10}^{6}\ensuremath{\Upsilon}(2S)$ decays and $117\ifmmode\times\else\texttimes\fi{}{10}^{6}\ensuremath{\Upsilon}(3S)$ decays collected with the BABAR detector. We place upper limits on the branching fractions $\mathcal{B}\mathbf{(}\ensuremath{\Upsilon}(nS)\ensuremath{\rightarrow}{e}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\tau}}^{\ensuremath{\mp}}\mathbf{)}$ and $\mathcal{B}\mathbf{(}\ensuremath{\Upsilon}(nS)\ensuremath{\rightarrow}{\ensuremath{\mu}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\tau}}^{\ensuremath{\mp}}\mathbf{)}$ ($n=2,3$) at the ${10}^{\ensuremath{-}6}$ level and use these results to place lower limits of order 1 TeV on the mass scale of charged-lepton flavor-violating effective operators.

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