Search for the rare decays $J/\psi \to D^{0} e^{+}e^{-} +c.c.$ and $\psi(3686) \to D^{0} e^{+}e^{-} +c.c.$

TL;DR

This study searches for rare $J/ar{psi}$ and $ar{ ext{psi}}(3686)$ decays into $D^0 e^+ e^-$, setting new upper limits and measuring the $ar{ ext{psi}}(3686)$ decay for the first time using large BESIII datasets.

Contribution

First measurement of $ar{ ext{psi}}(3686) o D^0 e^+ e^-$ decay and more stringent upper limits on $J/ar{psi}$ decay compared to previous studies.

Findings

No significant signals observed.

Upper limits set at $90\\%$ confidence level.

First measurement of $ar{ ext{psi}}(3686)$ decay.

Abstract

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.