Study of the ηc-decays

D.B. Bisello,G. Busetto,A. Castro,P. Gini,L. Pescara,P. Sartori,L. Stanco, Z. Ajaltouni,A. Dekmouche,A. Falvard,J. Jousset, P. Henrard,B. Michel,J.C. Montret,J.-E. Augustin, A. Calceterra,G. Cosme,F. Couchot,F. Fulda,G. Grosdidier,B. Jean-Marie,V. Lepeltier,G. Szklarz

Nuclear Physics B（1991）

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摘要

The ηc has been observed in hadronic decay modes from the 8.6 × 106 J/ψ's collected by the DM2 experiment at DCI. The ηc-mass is set to (2974.4 ± 1.9) MeV/c2. Its pseudoscalar character is measured from the ηc → ϱ0ϱ0and ψψ decays. The observation of the ηc → ψψ decays fixes the ηc-isospin to zero and the G-parity to be positive. An upper limit of Γγγ(ηc is set from the search for the ηc → γγ decay.

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