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

Abstract

Using 14.0 million $\psi (2S)eventscollectedwiththeBES-IIdetector,asearchforthedecayofthe$\jpsi$toaninvisiblefinalstatein$\psipto$isperformed.The$\jpsi$peakinthedistributionofmassrecoilingagainstthe$π^+π^-$isusedtotag$ψ$invisibledecay.Nosignalisfound,andanupperlimitatthe90$1.2\times 10^{-2}$fortheratio$\frac{{\cal B}(\jpsi\ar {invisible})}{{\cal B}(\jpsi\arμ^+μ^-)}$.Thisisthefirstsearchfor$J/ψ$ decay to an invisible final state.

arXiv comment5 pages, 3 figures

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