Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 9: Elektromagnetische und Hadronische Proben
HK 9.4: Vortrag
Freitag, 4. März 2005, 17:30–17:45, TU MA004
φ-meson production in pp collisions* — •M. Hartmann1, Y. Maeda1, I. Keshelashvilli1, H.R. Koch1, S. Mikirtytchiants2, and H. Ströher1 — 1Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany — 2High Energy Physics Department, Petersburg Nuclear Physics Institute, 188350 Gatchina, Russia
At the ANKE facility of COSY Jülich, data on φ-meson production in pp collisions in the near-threshold region have been obtained at incident beam energies of 2.83 GeV, 2.70 GeV and 2.65 GeV [1]. Detecting the K+K− decay mode we have identified 200-300 φ-mesons at each excess energy of 76 MeV, 35 MeV and 19 MeV, respectively. The energy dependence of the total cross section close to threshold will potentially give information on the production mechanism, in particular on the φNN coupling constant. Furthermore our result, combined with available SPESS-III and TOF results on ω-meson production, will provide information about violations of the OZI-rule.
As an exciting aspect an enhancement in the invariant φp mass spectrum is observed at a mass around 1.965 GeV/c2.
* supported by FZ-Jülich.
[1] Presented at the conference BARYONS 2004. Will be published in the journal Nuclear Physics A.