Search for the Invisible Decay of $\jpsi$ in $ψ(2S)\toπ+π^-J/ψ$

Details Search for the Invisible Decay of $\jpsi$ in $ψ(2S)\toπ+π^-J/ψ$ Search for the Invisible Decay of $\jpsi$ in $ψ(2S)\toπ+π^-J/ψ$

2007-09-29

arxiv.org/abs/0710.0039v2

Phys.Rev.Lett.100:192001,2008

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.100.192001

Using 14.0 million $\psi(2S) events collected with the BES-II detector, a search for the decay of the $\jpsi$ to an invisible final state in $\psipto$ is performed. The $\jpsi$ 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 $\frac{{\cal B}(\jpsi\ar {invisible})}{{\cal B}(\jpsi\ar\mu^+\mu^-)}$. This is the first search for $J/\psi$ decay to an invisible final state.

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