The Near-Threshold Production of Phi Mesons in pp Collisions
M. Hartmann, Y. Maeda, I. Keshelashvilli, H.R. Koch, S., Mikirtytchiants, S. Barsov, W. Borgs, M. Buescher, V.I. Dimitrov, S. Dymov,, V. Hejny, V. Kleber, V. Koptev, P. Kulessa, T. Mersmann, S. Merzliakov, A., Mussgiller, M. Nekipelov, M. Nioradze, H. Ohm, K. Pysz
TL;DR
This study measures the production of phi mesons in proton-proton collisions near the threshold energy, revealing S-wave dominance and an unexpected high phi/omega ratio, challenging existing theoretical predictions.
Contribution
First measurement of phi meson production cross sections near threshold in pp collisions, highlighting a significant deviation from OZI rule expectations.
Findings
S-wave dominance observed near threshold
Proton-proton final state interaction effects detected
Phi/omega ratio exceeds OZI rule predictions by a factor of 8
Abstract
The pp->pp phi reaction has been studied at the Cooler Synchrotron COSY-Juelich, using the internal beam and ANKE facility. Total cross sections have been determined at three excess energies epsilon near the production threshold. The differential cross section closest to threshold at epsilon=18.5 MeV exhibits a clear S-wave dominance as well as a noticeable effect due to the proton-proton final state interaction. Taken together with data for pp omega-production, a significant enhancement of the phi/omega ratio of a factor 8 is found compared to predictions based on the Okubo-Zweig-Iizuka rule.
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