Experimental study of the eta-meson interaction with two-nucleons

Details Experimental study of the eta-meson interaction with two-nucleons Experimental study of the eta-meson interaction with two-nucleons

2002-08-02

arxiv.org/abs/nucl-ex/0208004v1

Proceedings of Meson 2002: 7th International Workshop on Production, Properties and Interaction of Mesons, edited by L. Jarczy

Physics

Nuclear Physics

Nuclear Experiment

6 pages, 4 figures, Talk presented at Meson 2002, 7th International Workshop on Meson Production, Properties and Interaction,

Scientific paper

By means of the COSY-11 detection system, using a stochastically cooled proton beam of the cooler synchrotron COSY and a hydrogen cluster target, we have performed a high statistics measurement of the pp --> pp eta reaction at an excess energy of Q = 15.5 MeV. The experiment was based on the four-momentum determination of both outgoing protons. This permits to identify pp --> pp eta events and to derive the complete kinematical information of the eta-p-p-system allowing for subsequent investigations of the eta-p interaction. The observed spectrum of the invariant mass of the proton-proton system deviates strongly from the phase-space distribution revealing the influence of the final-state-interaction among the outgoing particles or nontrivial features of the primary production mechanism.

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