Search for the decay J/ψ→γ+ invisible

Le résumé fourni par la source

We search for $J/\ensuremath{\psi}$ radiative decays into a weakly interacting neutral particle, namely an invisible particle, using the $J/\ensuremath{\psi}$ produced through the process $\ensuremath{\psi}(3686)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi}$ in a data sample of $(448.1\ifmmode\pm\else\textpm\fi{}2.9)\ifmmode\times\else\texttimes\fi{}{10}^{6}\text{ }\text{ }\ensuremath{\psi}(3686)$ decays collected by the BESIII detector at BEPCII. No significant signal is observed. Using a modified frequentist method, upper limits on the branching fractions are set under different assumptions of invisible particle masses up to $1.2\text{ }\text{ }\mathrm{GeV}/{c}^{2}$. The upper limit corresponding to an invisible particle with zero mass is $7.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}$ at the 90% confidence level.

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