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arXiv · 1802.04057

Search for the rare decay of $\psi(3686) \rightarrow \Lambda_c^+ \overline{p} e^+ e^- + c.c.$ at BESIII

BESIII collaboration
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Abstract

Based on a data sample of $(448.1\pm2.9)\times10^6~\psi(3686)$ decays collected with the BESIII experiment, a search for the flavor changing neutral current transition $\psi(3686)\rightarrow \Lambda_c^+ \overline{p} e^+ e^- + c.c.$ is performed for the first time. No signal candidates are observed and the upper limit on the branching fraction of $\psi(3686)\rightarrow \Lambda_c^+ \overline{p} e^+ e^-$ is determined to be $1.7\times10^{-6}$ at the 90\% confidence level. The result is consistent with expectations from the Standard Model, and no evidence for new physics is found.

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BESIII collaboration. 2018-02-12. Search for the rare decay of $\psi(3686) \rightarrow \Lambda_c^+ \overline{p} e^+ e^- + c.c.$ at BESIII. https://doi.org/10.1103/physrevd.97.091102

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