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

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.

Note:

6 pages, 6 figures, submitted to EPJA

p p: inelastic scattering
Lambda: hadroproduction
Sigma0: hadroproduction
K+: associated production
channel cross section: ratio
energy dependence
mass spectrum: missing-mass
p hyperon: final-state interaction
approximation: effective range
magnetic spectrometer: experimental results

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