Study of the eta-proton interaction via the reaction pp->pp eta


A measurement of the pp->pp eta reaction at the excess energy of Q = 15.5 ± 0.4 MeV has been carried out at the internal beam facility COSY-11 with an integrated luminosity of 811 nb-1. The number of ~24000 identified events permits a precise determination of total (2.32 ± 0.05 ± 0.35 µb) and differential cross sections. Preliminary investigations show that the angular distribution of the eta meson in the center-of-mass system is isotropic. A qualitative analysis of the Dalitz-plot distribution is presented.

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pN Newsletter 16 (2002) 367