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BIBTEX RIS

First observation of the ηc→ϱ0ϱ0 decay

1988; Elsevier BV; Volume: 200; Issue: 1-2 Linguagem: Inglês

10.1016/0370-2693(88)91139-2

ISSN

1873-2445

Autores

D. Bisello, G. Busetto, A. Pereiro Castro, S. Limentani, M. Nigro, L. Pescara, M. Posocco, P. Sartori, L. Stanco, Z. Ajaltouni, A. Falvard, J. Jousset, B. Michel, Jean-Claude Montret, R. Baldini, S. Calcaterra, G. Capon, J-E. Augustin, G. Cosme, F. Couchot, B. Dudelzak, F. Fulda, G. Grosdidier, B. Jean-Marie, S. Jullian, D. Lalanne, V. Lepeltier, F. Manè, C. Paulot, R. Riskalla, Philippe Roy, G. Szklarz,

Tópico(s)

High-Energy Particle Collisions Research

Resumo

The decay J/ψ→γηc→γπ+π−π+π− has been studied from the 8.6×106 J/ψ produced in the DM2 apparatus at DCI. A clear signal of (137±23) events is observed in the ηc mass range. A partial wave analysis shows that the decay proceeds mainly through ϱ0ϱ0 dynamics with BR(J/ψ→γηc)×BR(ηc→ϱ0ϱ0)=(1.10±0.10±0.20)×10−4. The observation of the ηc→ϱ0ϱ0 decay gives the first high-statistics evidence of the pseudoscalar nature of the ηc.

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