Search for the Decay J / ψ → γ + invisible
نویسندگان
چکیده
A search for J/ψ radiative decay to weakly interacting neutral final states was performed using the CLEO-c detector at CESR. J/ψ events were selected by observing the hadronic decay ψ(2S) → π+π−J/ψ. A total of 3.7 × 106 J/ψ events was used to study the decay J/ψ → γ + X, where X is a narrow state that is invisible to the detector. No significant signal was observed and upper limits on the branching fraction were set for masses mX up to 960 MeV/c2. The upper limit corresponding to mX = 0 is 4.3 × 10−6 at the 90% confidence level.
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