Search for the Lepton-Flavor-Violating Decay ${\tau }^{-}\to {\mu }^{-}\eta$ at Belle

Abstract

We have searched for the Lepton Flavor Violating decay ${\tau }^{-}\to {\mu }^{-}\eta$ using a data sample of 84.3 fb${}^{-1}$ accumulated with the Belle detector at KEK. The $\eta$-meson was detected through the decay modes: $\eta \to \gamma \gamma$ and ${\pi }^{+}{\pi }^{-}{\pi }^0$. No signal candidates are found, and we obtain an upper limit for the branching fraction $\mathcal{B}({\tau }^{-}\to {\mu }^{-}\eta )<3.4\times 10^{-7}$ at the 90% confidence level.

Submitted to Phys.Rev.Lett

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