Search for the decay $J/\psi \to \gamma +\mathrm{invisible}$

Abstract

We search for $J/\psi$ radiative decays into a weakly interacting neutral particle, namely an invisible particle, using the $J/\psi$ produced through the process $\psi (3686)\to {\pi }^{+}{\pi }^{-}J/\psi$ in a data sample of $(448.1\pm 2.9)\times 10^6$ $\psi (3686)$ 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 $\mathrm{Ge}\mathrm{V}/c^2$. The upper limit corresponding to an invisible particle with zero mass is 7.0$\times 10^{-7}$ at the 90\% confidence level.

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