Search for the rare decays J/ψ→D0e+e−+c.c. and ψ(3686)→D0e+e−+c.c.

Le résumé fourni par la source

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

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.