Pseudoscalar ωω production at threshold in J/ψ→ψωω decay

The 8.6 million J/ψ collected by the DM2 detector at DCI have been analysed looking for the J/ψ→γωω decay, both ω's decaying into π +π −π 0. A clean signal of γωω events is observed with BR( J/ ψ→ γωω)=(1.41±0.20±0.42)×10 −3. The ωω invariant mass distribution shows a large bump peaked at 1.77...

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Published in:Physics letters. B 1987-06, Vol.192 (1), p.239-244
Main Authors: Bisello, D., Busetto, G., Castro, A., Limentani, S., Nigro, M., Pescara, L., Posocco, M., Sartori, P., Stanco, L., Ajaltouni, Z., Falvard, A., Jousset, J., Michel, B., Montret, J.C., Baldini, R., Calcaterra, S., Capon, G., Augustin, J.-E., Cosme, G., Couchot, F., Dudelzak, B., Fulda, F., Grosdidier, G., Jean-Marie, B., Jullian, S., Lalanne, D., Lepeltier, V., Mane, F., Paulot, C., Riskalla, R., Roy, Ph, Szklarz, G.
Format: Article
Language:English
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Summary:The 8.6 million J/ψ collected by the DM2 detector at DCI have been analysed looking for the J/ψ→γωω decay, both ω's decaying into π +π −π 0. A clean signal of γωω events is observed with BR( J/ ψ→ γωω)=(1.41±0.20±0.42)×10 −3. The ωω invariant mass distribution shows a large bump peaked at 1.77 GeV/ c 2, associated with a pseudoscalar production, as first observed by a previous experiment. No evidence of further structures is found.
ISSN:0370-2693
1873-2445
DOI:10.1016/0370-2693(87)91176-2