Hyperon single-particle potentials calculated from SU6 quark-model baryon-baryon interactions

Using the SU6 quark-model baryon-baryon interaction recently developed by the Kyoto-Niigata group, we calculate NN, ΛN and ΣN G -matrices in ordinary nuclear matter. This is the first attempt to discuss the Λ and Σ single-particle potentials in nuclear medium, based on the realistic quark-model potential. The Λ potential has the depth of more than 40 MeV, which is more attractive than the value expected from the experimental data of Λ -hypernuclei. The Σ potential turns out to be repulsive, the origin of which is traced back to the strong Pauli repulsion in the ΣN(I=3/2) 3S1 state