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

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

2004-01-19

arxiv.org/abs/nucl-ex/0401020v1

AIP Conf.Proc.717:852-857,2004

Physics

Nuclear Physics

Nuclear Experiment

6 pages, 3 figures, Presented at X. International Conference On Hadron Spectroscopy (Hadron 2003), Aschaffenburg, Germany, 31

Scientific paper

10.1063/1.1799807

Measurements of the near threshold Lambda and Sigma0 production via the pp-->pK+Lambda/Sigma0 reaction at COSY--11 have shown that the Lambda/Sigma0 cross section ratio exceeds the value at high excess energies Q>=300 MeV by an order of magnitude. For a better understanding additional data have been taken between 13 MeV and 60 MeV excess energy. Within the first 20 MeV excess energy a strong decrease of the cross section ratio is observed, with a less steep decrease in the higher excess energy range. A description of the data with a parametrisation including p-Y final state interactions suggests a much smaller p-Sigma0 FSI compared to the p-Lambda system.

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