Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 27: Electromagnetic and Hadronic Probes IV

HK 27.3: Talk

Wednesday, March 10, 2004, 11:30–11:45, E

Dynamics of the ω Meson Production in the Reaction pp→ ppω — •M. Schulte-Wissermann, K.-T. Brinkmann, S. Dschemuchadse, H. Freiesleben, R. Jäkel, L. Karsch, and G.Y. Sun — TU-Dresden

The ω meson production in nucleon-nucleon interactions has recently attracted considerable interest on the part of both experimental and theoretical physics. The elementary reaction dynamics is needed as an inevitable prerequisite in many fields of physics; e.g. the short range part of the nucleonic force (meson exchange models), the description of extremely dense matter (RHIC, cosmology), the strangeness content of nucleons (nuclear physics). However, the experimental database is far from complete, especially for differential observables. Furthermore, no experimental indication for Nω resonances has been found so far. New experimental data with high accuracy are desired.
  Due to its good solid angle coverage, the TOF-detector located at COSY is well suited to examine ω production in the reaction pp→ ppω. At excess energies of 93 and 173  MeV the ω signal is clearly identified above background. Total cross sections and angular distributions for both energies will be presented, where the latter are isotropic at 93  MeV while strongly anisotropic at 173  MeV. Although still compatible with phase-space within uncertainty limits, the invariant mass distributions of the pω-system may indicate a pω-resonance near the lower mass boundary.
   (Supported by BMBF and FZ-Jülich)