Improved Limits on Lepton-Flavor-Violating τ Decays to ℓϕ , ℓρ , ℓK* , and ℓK¯*

Le résumé fourni par la source

We search for the neutrinoless, lepton-flavor-violating tau decays ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\ell}}^{\ensuremath{-}}{V}^{0}$, where $\ensuremath{\ell}$ is an electron or muon and ${V}^{0}$ is a vector meson reconstructed as $\ensuremath{\phi}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}$, $\ensuremath{\rho}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, ${K}^{*}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, ${\overline{K}}^{*}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$. The analysis has been performed using $451\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected at an ${e}^{+}{e}^{\ensuremath{-}}$ center-of-mass energy near 10.58 GeV with the BABAR detector at the PEP-II storage rings. The number of events found in the data is compatible with the background expectation, and upper limits on the branching fractions are set in the range $(2.6--19)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$ at the 90% confidence level.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.