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Search for the rare decays J/psi to D⁰ e⁺e⁻ +c.c. and psi(3686) to D⁰ e⁺e⁻ +c.c.
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arxiv 1710.02278 v1 pith:437ESRR5 submitted 2017-10-06 hep-ex
Search for the rare decays J/psi to D⁰ e⁺e⁻ +c.c. and psi(3686) to D⁰ e⁺e⁻ +c.c.
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Using the data samples of $(1310.6\pm7.2 )\times 10^{6}$ $J/\psi$ events and $(448.1\pm2.9)\times 10^{6}$ $\psi(3686)$ events collected with the BESIII detector, we search for the rare decays $J/\psi \to D^{0} e^{+}e^{-} +c.c.$ and $\psi(3686) \to D^{0} e^{+}e^{-} +c.c.$. No significant signals are observed and the corresponding upper limits on the branching fractions at the $90\%$ confidence level are determined to be $Br(J/\psi \to D^{0} e^{+}e^{-} +c.c.)< 8.5\times 10^{-8}$ and $Br (\psi(3686) \to D^{0} e^{+}e^{-} +c.c.)<1.4\times 10^{-7}$, respectively. Our limit on $Br(J/\psi \to D^{0} e^{+}e^{-} +c.c.)$ is more stringent by two orders of magnitude than the previous results, and the $Br(\psi(3686) \to D^{0} e^{+}e^{-} +c.c.)$ is measured for the first time.
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