Search for the decay J/ψ→γ+invisible

J. Insler,H. Muramatsu,C. S. Park,E. H. Thorndike, F. Yang,S. Ricciardi,C. Thomas,M. Artuso,S. Blusk, S. Khalil,T. Skwarnicki, S. Stone,J. C. Wang,L. M. Zhang,G. Bonvicini,D. Cinabro,A. Lincoln,M. J. Smith, P. Zhou,J. Zhu,P. Naik, J. Rademacker,D. M. Asner,K. W. Edwards, K. Randrianarivony,J. Reed,A. N. Robichaud,G. Tatishvili,E. J. White,R. A. Briere,H. Vogel,P. U. E. Onyisi,J. L. Rosner,D. G. Cassel,R. Ehrlich, L. Gibbons,S. W. Gray,D. L. Hartill,B. K. Heltsley, J. M. Hunt,D. L. Kreinick,V. E. Kuznetsov,J. Ledoux, H. Mahlke-Kruger,J. R. Patterson, D. Peterson,D. Riley, A. Ryd,A. J. Sadoff,S. Stroiney,W. M. Sun, J. Yelton,P. Rubin,N. Lowrey,S. Mehrabyan,M. Selen,J. Wiss,M. Kornicer,R. E. Mitchell,M. R. Shepherd,C. M. Tarbert,D. Besson,T. K. Pedlar,J. Xavier,D. Cronin-Hennessy,K. Y. Gao,J. Hietala, R. Poling,P. Zweber,Z. Metreveli,K. K. Seth,B. J. Y. Tan, A. Tomaradze,S. Brisbane,J. Libby,L. Martin,A. Powell,P. Spradlin, G. Wilkinson,H. Mendez,J. Y. Ge,D. H. Miller, I. P. J. Shipsey,B. Xin,G. S. Adams,D. Hu,J. Napolitano,K. M. Ecklund,B. Xin,G. S. Adams,D. Hu,B. Moziak,J. Napolitano,K. M. Ecklund

PHYSICAL REVIEW D（2010）

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摘要

A search for J/psi radiative decay to weakly interacting neutral final states was performed using the CLEO-c detector at the Cornell Electron Storage Ring. J/psi events were selected by observing the hadronic decay psi(2S) -> pi(+)pi(-) J/psi. A total of 3.7 x 10(6) J/psi events were used to study the decay J/psi -> gamma + 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 m(X) up to 960 MeV/c(2). The upper limit corresponding to m(X) = 0 is 4.3 x 10(-6) at the 90% confidence level.

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