Search for Baryon and Lepton Number Violation in $J/\psi \to {\Lambda }_c^{+}{e}^{-}+c.c.$

Abstract

Using $1.31\times 10^9$ $J/\psi$ events collected by the BESIII detector at the Beijing Electron Positron Collider, we search for the process $J/\psi \to {\Lambda }_c^{+}{e}^{-}+c.c.$ for the first time. In this process, both baryon and lepton number conservation is violated. No signal is found and the upper limit on the branching fraction $\mathcal{B}(J/\psi \to {\Lambda }_c^{+}{e}^{-}+c.c.)$ is set to be $6.9\times 10^{-8}$ at the 90\% Confidence Level.

arXiv comment6 pages, 2 figures

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• Search for the baryon- and lepton-number violating decays $B^0\to p{\mu }^{-}$ and $B_s^0\to p{\mu }^{-}$
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