Energy Dependence of the Near-Threshold Total Cross-Section for the pp --> pp eta' Reaction
P. Moskal, H. -H. Adam, J. T. Balewski, V. Baru, A. Budzanowski, D. Grzonka, J. Haidenbauer, L. Jarczyk, A. Khoukaz, K. Kilian, M. Koehler, P. Kowina, A. Kudryavtsev, N. Lang, T. Lister, W. Oelert, C. Quentmeier, R. Santo, G. Schepers, T. Sefzick, S. Sewerin, M. Siemaszko, J. Smyrski, A. Strzalkowski, M. Wolke, P. Wuestner, W. Zipper
Abstract
Total cross sections for the pp --> pp eta' reaction have been measured in the excess energy range from Q = 1.53 MeV to Q = 23.64 MeV. The experiment has been performed at the internal installation COSY-11 using a stochastically cooled proton beam of the COoler SYnchrotron COSY and a hydrogen cluster target. The determined energy dependence of the total cross section weakens the hypothesis of the S-wave repulsive interaction between the eta' meson and the proton. New data agree well with predictions based on the phase-space distribution modified by the proton-proton final-state-interaction (FSI) only.
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