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

Collaboration
Mar 21, 2021
10 pages
Published in:
  • Phys.Rev.D 103 (2021) 11, 112007
  • Published: Jun 1, 2021
    and
  • Published: Jun 23, 2021
e-Print:
DOI:
Experiments:

Citations per year

202120222023202411146
Abstract: (APS)
A search for the charged lepton flavor violating decay J/ψe±τJ/\psi\to e^{\pm}\tau^{\mp} with τππ0ντ\tau^{\mp} \to \pi^{\mp}\pi^0\nu_{\tau} is performed with about 1010 billion J/ψJ/ \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 B(J/ψe±τ)<7.5×108\mathcal{B}(J/\psi\to e^{\pm}\tau^{\mp})<7.5\times10^{-8} at the 90%\% confidence level. This improves the previously published limit by two orders of magnitude.
Note:
  • 9 pages, 4 figures, 2 tables
  • new physics
  • lepton: flavor: violation
  • BES
  • Beijing Stor
  • J/psi(3100): leptonic decay
  • J/psi(3100): rare decay
  • J/psi(3100): branching ratio
  • branching ratio: upper limit
  • J/psi(3100) --> electron tau