Study of the Dalitz decay J/ψ→e+e−η
М. Н. Ачасов, S. Ahmed, M. Albrecht, M. Alekseev et autres
We study the electromagnetic Dalitz decay $J/\ensuremath{\psi}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}\ensuremath{\eta}$ and search for dielectron decays of a dark gauge boson (${\ensuremath{\gamma}}^{\ensuremath{'}}$) in $J/\ensuremath{\psi}\ensuremath{\rightarrow}{\ensuremath{\gamma}}^{\ensuremath{'}}\ensuremath{\eta}$ with the two $\ensuremath{\eta}$ decay modes $\ensuremath{\eta}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}$ and $\ensuremath{\eta}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ using $(1310.6\ifmmode\pm\else\textpm\fi{}7.0)\ifmmode\times\else\texttimes\fi{}{10}^{6}\text{ }\text{ }J/\ensuremath{\psi}$ events collected with the BESIII detector. The branching fraction …
cn, ru, de, it, mn, us, tr, nl (code pays fourni par la source)