Search for lepton-flavor-violating tau-lepton decays to $\ell��$ at Belle

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doi:10.48550/arxiv.2103.12994

Charged lepton flavor violation is forbidden in the Standard Model but possible in several new physics scenarios. In many of these models, the radiative decays $��^{\pm}\rightarrow\ell^{\pm}��$ ($\ell=e,��$) are predicted to have a sizeable probability, making them particularly interesting channels to search at various experiments. An updated search via $��^{\pm}\rightarrow\ell^{\pm}��$ using full data of the Belle experiment, corresponding to an integrated luminosity of 988 fb$^{-1}$, is reported for charged lepton flavor violation. No significant excess over background predictions from the Standard Model is observed, and the upper limits on the branching fractions, $\mathcal{B}(��^{\pm}\rightarrow ��^{\pm}��)$ $\leq$ $4.2\times10^{-8}$ and $\mathcal{B}(��^{\pm}\rightarrow e^{\pm}��)$ $\leq$ $5.6\times10^{-8}$, are set at 90\% confidence level.

Search for lepton-flavor-violating tau-lepton decays to $\ell��$ at Belle

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