- Conference date: 31 August-6 September 2003
- Location: Aschaffenburg (Germany)
Measurements of the near threshold Λ and Σ0 production via the pp → pK + Λ/Σ0 reaction at COSY‐11 have shown that the Λ/Σ0 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 − Σ0 FSI compared to the p − Λ system.
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