Search for the charged lepton flavor violating decay $J/\psi \to e\tau$

Abstract

A search for the charged lepton flavor violating decay $J/\psi \to e^{\pm }{\tau }^{\mp }$ with ${\tau }^{\mp }\to {\pi }^{\mp }{\pi }^0{\nu }_{\tau }$ is performed with about $10$ billion $J/\psi$ events collected with the BESIII detector at the BEPCII. No significant signal is observed, and an upper limit is set on the branching fraction $\mathcal{B}(J/\psi \to e^{\pm }{\tau }^{\mp })<7.5\times 10^{-8}$ at the 90$\%$ confidence level. This improves the previously published limit by two orders of magnitude.

9 pages, 4 figures, 2 tables

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Cited by in corpus (11)

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• Indirect constraints on lepton-flavour-violating quarkonium decays
• Visualization for physics analysis improvement and applications in BESIII
• Search for the lepton flavor violating decay $J/\psi \to e\mu$
• Observation of the double Dalitz decay ${\eta }^{\prime }\to e^{+}{e}^{-}{e}^{+}{e}^{-}$
• The lepton flavor violating decays of vector mesons in the MRSSM
• Charged lepton flavor violation searches in the charmonium system
• Exploring hadronic de-excitation via Lepton Flavor Violation
• Constraining lepton flavor violating SMEFT $2q2\ell$ operators from low-energy cLFV processes
• Search for the charged lepton flavor violating decay $\psi (3686)\to e^{\pm }{\mu }^{\mp }$
• Searches for charged-lepton-flavor violation in ${\chi }_{bJ}(1P)$ decays