Measurement of the η production in proton-proton collisions with the COSY time-of-flight spectrometer


Measurement of the η production in proton-proton collisions with the COSY time-of-flight spectrometer

Abdel-Bary, M.; Abdel-Samad, S.; Bilger, R.; Brinkmann, K.-T.; Clement, H.; Dshemuchadse, S.; Dorochkevitch, E.; Dutz, H.; Eyrich, W.; Erhardt, A.; Filges, D.; Filippi, A.; Freiesleben, H.; Fritsch, M.; Geyer, R.; Gillitzer, A.; Hesselbarth, D.; Jakob, B.; Karsch, L.; Kilian, K.; Koch, H.; Kreß, J.; Kuhlmann, E.; Marcello, S.; Marwinski, S.; Mauro, S.; Meyer, W.; Michel, P.; Möller, K.; Morsch, H. P.; Naumann, L.; Paul, N.; Richter, M.; Roderburg, E.; Rogge, M.; Schamlott, A.; Schmitz, M.; Schönmeier, P.; Schulte-Wissermann, M.; Schroeder, W.; Sefzik, T.; Stinzing, F.; Sun, G. Y.; Wagner, G. J.; Wagner, M.; Wilms, A.; Wintz, P.; Wirth, S.; Zupranski, P.

The reaction pp to pp η was measured at excess energies of 15 and 41 MeV at an external target of the Jülich Cooler Synchrotron COSY with the time-of-flight spectrometer. About 25000 events were measured for the excess energy of 15 MeV and about 8000 for 41 MeV. Both protons of the process pp η were detected with an acceptance of nearly 100 % and the η was reconstructed by the missing-mass technique. For both excess energies the angular distributions are found to be nearly isotropic. In the invariant-mass distributions strong derivations from the pure phase space distributions are seen.

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Publ.-Id: 5451