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Search for charged-lepton flavor violation in Upsilon(2S) to ell^mpτ^pm (ell=e,μ) decays at Belle
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arxiv 2309.02739 v2 pith:JIBVNS7E submitted 2023-09-06 hep-ex
Search for charged-lepton flavor violation in Upsilon(2S) to ell^mpτ^pm (ell=e,μ) decays at Belle
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We report a search for the charged-lepton flavor violation in $\Upsilon(2S) \to \ell^\mp\tau^\pm$ ($\ell=e,\mu$) decays using a $25~\fbi$ $\Upsilon(2S)$ sample collected by the Belle detector at the KEKB $e^{+}$$e^-$ asymmetric-energy collider. We find no evidence for a signal and set upper limits on the branching fractions ($\mathcal{B}$) at 90\% confidence level. We obtain the most stringent upper limits: $\mathcal{B}(\Ytomutau) < 0.23 \times 10^{-6}$ and $\mathcal{B}(\Ytoetau) < 1.12 \times 10^{-6}$.
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