Near-threshold production of phi mesons in pp collisions

Near-threshold production of phi mesons in pp collisions

The pp-->ppphi reaction has been studied at the Cooler Synchrotron COSY-Jülich, 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...

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Veröffentlicht in:Physical review letters 2006-06, Vol.96 (24), p.242301-242301
Hauptverfasser: Hartmann, M, Maeda, Y, Keshelashvili, I, Koch, H R, Mikirtytchiants, S, Barsov, S, Borgs, W, Büscher, M, Dimitrov, V I, Dymov, S, Hejny, V, Kleber, V, Koptev, V, Kulessa, P, Mersmann, T, Merzliakov, S, Mussgiller, A, Nekipelov, M, Nioradze, M, Ohm, H, Pysz, K, Schleichert, R, Stein, H J, Ströher, H, Watzlawik, K-H, Wüstner, P
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Sprache:eng
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Zusammenfassung:The pp-->ppphi reaction has been studied at the Cooler Synchrotron COSY-Jülich, 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 ppomega 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.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.96.242301