Search for Lepton Flavor Violating tau^- Decays into \ell^-η, \ell^-η' and \ell^-π^0

Abstract

We have searched for lepton-flavor-violating $\tau$ decays with a pseudoscalar meson ($\eta$, ${\eta }^{\prime }$ {and} ${\pi }^0$) using a data sample of 401 fb${}^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. No evidence for these decays is found and we set the following upper limits on the branching fractions: $\mathcal{B}({\tau }^{-}\to e^{-}\eta )<9.2\times 10^{-8}$, $\mathcal{B}({\tau }^{-}\to {\mu }^{-}\eta )<6.5\times 10^{-8}$, $\mathcal{B}({\tau }^{-}\to e^{-}{\eta }^{\prime })<1.6\times 10^{-7}$, $\mathcal{B}({\tau }^{-}\to {\mu }^{-}{\eta }^{\prime })<1.3\times 10^{-7}$, $\mathcal{B}({\tau }^{-}\to e^{-}{\pi }^0)<8.0\times 10^{-8}$ and $\mathcal{B}({\tau }^{-}\to {\mu }^{-}{\pi }^0)<1.2\times 10^{-7}$ at the 90% confidence level. These results improve our previously published upper limits by factors from 2.3 to 6.3.

16 pages, 15 figures, submitted to Phys.Lett. B

References in corpus (4)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• Search for Lepton Flavor Violating Decays ${\tau }^{\pm }\to {\ell }^{\pm }{\pi }^0,{\ell }^{\pm }\eta ,{\ell }^{\pm }{\eta }^{\prime }$
• Lepton flavor violation in $\tau$ decays
• Search for Neutral Higgs Bosons Decaying to Tau Pairs in p-pbar Collisions at sqrt(s) = 1.96 TeV

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