Energy dependence of the Λ/Σproduction cross-section ratio in p-p interactions
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- Kowina, P., Wolke, M., Adam, H.H. et al. Eur. Phys. J. A (2004) 22: 293. doi:10.1140/epja/i2003-10236-6
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The production of the Λ- and Σ0-hyperons has been measured via the pp → pK+Λ/Σ0 reaction at the internal COSY-11 facility in the excess energy range between 14 and 60 MeV. The transition of the Λ/Σ0 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-Σ0 channel seem to be much smaller than in the p-Λ channel. Estimates of the effective range parameters are given for the NΛ and the NΣ systems.