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

2007/10/31 by M. Ablikim, J. Z. Bai · 1 citation
Physics and Astronomy · #hep-ex

paper · pdf · doi:10.1103/physrevlett.100.192001

published as Phys.Rev.Lett.100:192001,2008 · 5 pages, 3 figures

arxiv created 2008/04/17 · arxiv updated 2009/12/01

Abstract

Using 14.0 million ψ(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 π⁺π^- is used to tag ψ invisible decay. No signal is found, and an upper limit at the 90% confidence level is determined to be 1.2× 10^-2 for the ratio \frac\cal B(\jpsi\ar invisible)\cal B(\jpsi\arμ⁺μ^-). This is the first search for J/ψ decay to an invisible final state.

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