Production of Φ and ω Mesons in Near Threshold pp Reactions

Balestra, F.; Bedfer, Y.; Bertini, R.; Bland, L. C.; Brenschede, A.; Brochard, F.; Bussa, M. P.; Chalyshev, V.; Seonho, C.; Debowski, M.; Dzemidzic, M.; Faivre, J.-Cl.; Falomkin, I. V.; Fava, L.; Ferrero, L.; Foryciarz, J.; Frolov, V.; Garfagnini, R.; Gill, D.; Grasso, A.; Grosse, E.; Heinz, S.; Ivanov, V. V.; Jacobs, W. W.; Kühn, W.; Maggiora, A.; Maggiora, M.; Manara, A.; Panzieri, D.; Pfaff, H.-W.; Piragino, G.; Pontecorvo, G. B.; Popov, A.; Ritman, J.; Salabura, P.; Senger, P.; Stroth, J.; Tosello, F.; Vigdor, S. E.; Zosi, G.

Production of Φ and ω Mesons in Near Threshold pp Reactions

Balestra, F.; Bedfer, Y.; Bertini, R.; Bland, L. C.; Brenschede, A.; Brochard, F.; Bussa, M. P.; Chalyshev, V.; Seonho, C.; Debowski, M.; Dzemidzic, M.; Faivre, J.-C.; Falomkin, I. V.; Fava, L.; Ferrero, L.; Foryciarz, J.; Frolov, V.; Garfagnini, R.; Gill, D.; Grasso, A.; Grosse, E.; Heinz, S.; Ivanov, V. V.; Jacobs, W. W.; Kühn, W.; Maggiora, A.; Maggiora, M.; Manara, A.; Panzieri, D.; Pfaff, H.-W.; Piragino, G.; Pontecorvo, G. B.; Popov, A.; Ritman, J.; Salabura, P.; Senger, P.; Stroth, J.; Tosello, F.; Vigdor, S. E.; Zosi, G.

The ratio of the exclusive production cross sections for Φ and ω mesons has been measured in pp reactions at T_beam = 2.85 GeV. The observed f/w ratio is (3.7±0.7^+1.2_-0.9)×10^-3. After phase space corrections, this ratio is about a factor 10 enhanced relative to naive predictions based upon the Okubo-Zweig-Iizuka (OZI) rule, in comparison to an enhancement by a factor ~ 3 previously observed at higher energies. The modest increase of this enhancement near the production threshold is compared to the much larger increase of the Φ/ω ratio observed in specific channels of ` >pp annihilation experiments.

Physical Review Letters 81 (1998) 4572-4575

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