Energy Dependence of the Near-Threshold Total Cross-Section for the pp --> pp eta' Reaction

Moskal, P.; Adam, H. -H.; Balewski, J. T.; Baru, V.; Budzanowski, A.; Grzonka, D.; Haidenbauer, J.; Jarczyk, L.; Khoukaz, A.; Kilian, K.; Koehler, M.; Kowina, P.; Kudryavtsev, A.; Lang, N.; Lister, T.; Oelert, W.; Quentmeier, C.; Santo, R.; Schepers, G.; Sefzick, T.; Sewerin, S.; Siemaszko, M.; Smyrski, J.; Strzalkowski, A.; Wolke, M.; Wuestner, P.; Zipper, W.

Energy Dependence of the Near-Threshold Total Cross-Section for the pp --> pp eta' Reaction

Authors

Description

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.
12 pages, 1 table, 4 figures