Sumitted to PubDB: 2024-03-11

Category: Talk, Visibility: Public

Tags: -

Authors
Non-Belle II authors	Rashmi Dhamija
Date	2024-02-26
Belle II Number	BELLE2-TALK-CONF-2024-030
Abstract	We report a search for the charged-lepton flavor violation in $\mathrm{{\rm Y}}(2S)\to {\ell }^{\mp }{\tau }^{\pm }(\ell =e,\mu )$ decays using a 25 ${\mathrm{f}\mathrm{b}}^{-1}\mathrm{{\rm Y}}(2\mathrm{S})$ 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 (B) at a 90% confidence level. We obtain the most stringent upper limits: $\mathcal{B}(\mathrm{{\rm Y}}(2S)\to {\mu }^{\mp }{\tau }^{\pm })<0.23\times {10}^{-6}$ and $\mathcal{B}(\mathrm{{\rm Y}}(2S)\to e^{\mp }{\tau }^{\pm })<1.12\times {10}^{-6}$.
Conference	QWG 2024 - The 16th International Workshop on Heavy Quarkonium

• BELLE2-TALK-CONF-2024-030.pdf (versions: 1)
  latest upload: 2024-12-02