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

Rapid Communication

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

M. Ablikim et al. (BESIII Collaboration)

Phys. Rev. D 96, 111101(R) – Published 6 December 2017

Abstract

Using the data samples of $(1310.6 \pm 7.2) \times 10^{6} J / ψ$ events and $(448.1 \pm 2.9) \times 10^{6} ψ (3686)$ events collected with the BESIII detector, we search for the rare decays $J / ψ \to D^{0} e^{+} e^{-} + c . c .$ and $ψ (3686) \to D^{0} e^{+} e^{-} + c . c .$ No significant signals are observed and the corresponding upper limits on the branching fractions at the 90% confidence level are determined to be $B (J / ψ \to D^{0} e^{+} e^{-} + c . c .) < 8.5 \times 10^{- 8}$ and $B (ψ (3686) \to D^{0} e^{+} e^{-} + c . c .) < 1.4 \times 10^{- 7}$ , respectively. Our limit on $B (J / ψ \to D^{0} e^{+} e^{-} + c . c .)$ is more stringent by 2 orders of magnitude than the previous results, and $B (ψ (3686) \to D^{0} e^{+} e^{-} + c . c .)$ is measured for the first time.