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

Abstract

We present a search for the lepton flavor violating decay $J/\psi \to e^{\pm }{\mu }^{\mp }$ using $8.998\times 10^{9}J/\psi$ events collected with the BESIII detector at the BEPCII $e^{+}{e}^{-}$ storage ring. No excess of signal above background is observed; we therefore set an upper limit on the branching fraction of $\mathcal{B}(J/\psi \to e^{\pm }{\mu }^{\mp })<4.5\times 10^{-9}$ at the $90\%$ confidence level. Improving the previous best result by a factor of more than 30, this measurement places the most stringent limit to date on lepton flavor violation in the heavy quarkonium sector.

12 pages, 4 figures

References in corpus (8)

• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
• Method for detector description transformation to Unity and application in BESIII
• Technical design of the phase I Mu3e experiment
• Search for the lepton flavor violating decay $Z\to e\mu$ in pp collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
• Search for Lepton Flavor Violating Decays of the Neutral Kaon
• Lepton flavor violating quarkonium decays
• New bounds on lepton flavor violating decays of vector mesons and the Z0 boson
• Search for the charged lepton flavor violating decay $J/\psi \to e\tau$

Cited by in corpus (6)

• Visualization for physics analysis improvement and applications in BESIII
• A Comparative Study of Z${}^{\prime }$ mediated Charged Lepton Flavor Violation at future lepton colliders
• The lepton flavor violating decays of vector mesons in the MRSSM
• Charged lepton flavor violation searches in the charmonium system
• Search for the charged lepton flavor violating decay $\psi (3686)\to e^{\pm }{\mu }^{\mp }$
• Constraining lepton flavor violating SMEFT $2q2\ell$ operators from low-energy cLFV processes