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

P. Moskal (Jagellonian U. & Julich , Forschungszentrum) , H.H. Adam , A. Budzanowski , R. Czyzykiewicz , T. Gotz , D. Grzonka , L. Jarczyk

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A. Khoukaz K. Kilian C. Kolf P. Kowina N. Lang T. Lister W. Oelert C. Quentmeier R. Santo G. Schepers T. Sefzick M. Siemaszko J. Smyrski S. Steltenkamp A. Strzalkowski P. Winter M. Wolke P. Wustner W. Zipper (Jagellonian U. & Julich Forschungszentrum & Munster U. & Cracow INP & Silesia U.)

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keywords distributionreactionanalysisangularbeambeencarriedcenter-of-mass

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A measurement of the pp --> p p 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 \mu b) 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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Study of the eta-proton interaction via the reaction p p --> p p eta

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