Search for the Lepton Flavor Violation Processes $J/ψ\to$ $μτ$ and $eτ$

Details Search for the Lepton Flavor Violation Processes $J/ψ\to$ $μτ$ and $eτ$ Search for the Lepton Flavor Violation Processes $J/ψ\to$ $μτ$ and $eτ$

2004-06-07

arxiv.org/abs/hep-ex/0406018v1

Phys.Lett.B598:172-177,2004

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, 2 figures

Scientific paper

10.1016/j.physletb.2004.08.005

The lepton flavor violation processes $J/\psi \to \mu\tau$ and $e\tau$ are searched for using a sample of 5.8$\times 10^7$ $J/\psi$ events collected with the BESII detector. Zero and one candidate events, consistent with the estimated background, are observed in $J/\psi \to \mu\tau, \tau\to e\bar\nu_e\nu_{\tau}$ and $J/\psi\to e\tau, \tau\to\mu\bar\nu_{\mu}\nu_{\tau}$ decays, respectively. Upper limits on the branching ratios are determined to be $Br(J/\psi\to\mu\tau)<2.0 \times 10^{-6}$ and $Br(J/\psi \to e\tau) < 8.3 \times10^{-6}$ at the 90% confidence level (C.L.).

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