Dr Hua-Xing Chen (IFIC, Valencia University)
We report on a theoretical study of the pp \to p Lambda K+ and pp \to p Sigma0 K+ reactions near threshold using a chiral dynamical approach. The production process is described by single-pion and single-kaon exchange. The final state interactions of nucleon-hyperon, K-hyperon and K-nucleon systems are also taken into account. We show that our model leads to a fairly good description of the experimental data on the total cross section of the pp \to p Lambda K+ reaction. We find that the experimental observed strong suppression of Sigma0 production compared to Lambda production at the same excess energy can be explained. In addition we obtain the scattering length and effective range for the Lambda p interaction.