Hadronic interaction of the eta meson with two nucleons

Abstract

The COSY-11 collaboration has conducted experiments aiming at the determination of the excitation function and phase-space population of the p p --> p p eta reaction close to the kinematical threshold. The precise data obtained with the stochastically cooled proton beam of the cooler synchrotron COSY and the high resolution zero-degree magnetic spectrometer allowed for the observation of the significant deviations - in the shape of the excitation function and two-particle invariant masses - from the predictions based on the assumption that the reaction phase space is homogenously populated. Comparison of the shape of the excitation function for the p p --> p p eta and p p --> p p eta-prime reaction allows to distinquish in the model independent way an influence originating from the proton-proton and proton-eta interaction. For the comparison the full data set from experiments performed at COSY and other laboratories is used.

arXiv commentTalk given at 10th International Symposium on Meson-Nucleon Physics and the Structure of the Nucleon (MENU 2004), Beijing, China, 29 Aug - 4 Sep 2004, 4 pages, 1 figure, to be published in Int. J. Mod. Phys

References in corpus (11)

• Comparison of eta and eta' production in the pp -> pp eta(eta') reactions near threshold
• Close-to-threshold Meson Production in Hadronic Interactions
• Novel approach to pion and eta production in proton-proton collisions near threshold
• The Eta-Nucleon Scattering Length and Effective Range
• Experimental study of pp eta dynamics in the pp --> ppeta reaction
• Measurement of the Eta Production in Proton Proton Collisions with the COSY Time of Flight Spectrometer
• An analysis of the reaction pp --> ppηnear threshold
• Production of eta mesons in nucleon-nucleon collisions
• Phenomenology of pp->pp eta reaction close to threshold
• Consistent analysis of the reaction $\gamma p\to p{\eta }^{\prime }$ and $pp\to pp{\eta }^{\prime }$
• Final state interaction in the reaction NN -> eta NN

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• The U(1)_A Anomaly and QCD Phenomenology