Energy dependence of the Lambda/Sigma0 production cross section ratio in proton proton interactions

Kowina, P.; Wolke, M.; Adam, H. -H.; Budzanowski, A.; Czyzykiewicz, R.; Grzonka, D.; Haidenbauer, J.; Janusz, M.; Jarczyk, L.; Kamys, B.; Khoukaz, A.; Kilian, K.; Moskal, P.; Oelert, W.; Piskor-Ignatowicz, C.; Przerwa, J.; Quentmeier, C.; Rozek, T.; Santo, R.; Schepers, G.; Sefzick, T.; Siemaszko, M.; Smyrski, J.; Steltenkamp, S.; Strzalkowski, A.; Taschner, A.; Winter, P.; Wustner, P.; Zipper, W.

Energy dependence of the Lambda/Sigma0 production cross section ratio in proton proton interactions

Authors

Description

The production of the Lambda and Sigma0 hyperons has been measured via the pp->pK+Lambda / Sigma0 reaction at the internal COSY-11 facility in the excess energy range between 14 and 60 MeV. The transition of the Lambda/Sigma0 cross section ratio from about 28 at Q<=13 MeV to the high energy level of about 2.5 is covered by the data showing a strong decrease of the ratio between 10 and 20 MeV excess energy. Effects from the final state interactions in the p-Sigma0 channel seem to be much smaller compared to the p-Lambda one. Estimates of the effective range parameters are given for the N-Lambda and the N-Sigma systems.
6 pages, 6 figures, submitted to EPJA