The ratio of the exclusive production cross sections for phi and omega mesons has been measured in pp reactions at T-beam = 2.85 GeV. The observed phi/omega ratio is (3.7 +/- 0.7(-0.9)(+1.2)) X 10(-3). After phase space corrections, this ratio is about a factor of 10 enhanced relative to naive predictions based upon the Okubo-Zweig-Iizuka rule, in comparison to an enhancement by a factor of similar to 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 phi/omega ratio observed in specific channels of <(p)over bar p> annihilation experiments.
Production of phi and omega mesons in near-threshold pp reactions
BALESTRA, Ferruccio;BERTINI, Raimondo Pietro;BUSSA, Maria Pia;FAVA, Luciano;FERRERO, Livio;FROLOV, VLADIMIR;GRASSO, Antonino;MAGGIORA, MARCO;PANZIERI, Daniele;PIRAGINO, Guido;ZOSI, Gianfranco
1998-01-01
Abstract
The ratio of the exclusive production cross sections for phi and omega mesons has been measured in pp reactions at T-beam = 2.85 GeV. The observed phi/omega ratio is (3.7 +/- 0.7(-0.9)(+1.2)) X 10(-3). After phase space corrections, this ratio is about a factor of 10 enhanced relative to naive predictions based upon the Okubo-Zweig-Iizuka rule, in comparison to an enhancement by a factor of similar to 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 phi/omega ratio observed in specific channels of <(p)over bar p> annihilation experiments.File | Dimensione | Formato | |
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1998_PRL_81_4572-4575.pdf
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