Search for the Invisible Decay of $\text{jpsi}$ in $\psi (2S)\to \pi +{\pi }^{-}J\mathrm{/}\psi$

Using 14.0 million $\psi(2S) events collected with the BES-II detector, a search for the decay of the $\text{jpsi}$ to an invisible final state in $\text{psipto}$ is performed. The $\text{jpsi}$ peak in the distribution of mass recoiling against the ${\pi }^{+}{\pi }^{-}$ is used to tag $\psi$ invisible decay. No signal is found, and an upper limit at the 90% confidence level is determined to be $1.2\times {10}^{-2}$ for the ratio $\frac{{\cal B}(\jpsi\ar {invisible})}{{\cal B}(\jpsi\ar\mu^+\mu^-)}$\mathrm{.}Thisisthefirstsearchfor$J/\psi$ decay to an invisible final state.