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

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

2004-02-06

arxiv.org/abs/nucl-ex/0402008v1

Eur.Phys.J.A22:293-299,2004

Physics

Nuclear Physics

Nuclear Experiment

6 pages, 6 figures, submitted to EPJA

Scientific paper

10.1140/epja/i2003-10236-6

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.

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