Baryon-baryon interaction of strangeness S = −1 sector

Abstract

We present our recent studies on hyperon-nucleon (YN) interactions in the strangeness S = −1 that pΛ, Σ0 p and Σ+n, by extracting corresponding potentials through Nambu-Bethe-Salpeter wave functions. We calculate ΛN and ΣN potentials in the isospin I = 3/2 channel, using the Nf = 2 + 1 gauge configurations generated by PACS-CS collaboration and employing an improved method to obtain potentials in lattice QCD simulations. For the 1S0 channel, the central ΣN(I = 3/2,1 S0) potential and the central ΛN(1S0) potential are found to be very similar. In the spin triplet (3S1 −3 D1) channels, the central ΛN(3S1 −3 D1) potential is attractive while the central ΣN(I = 3/2,3 S1 −3 D1) potentials is repulsive. Tensor potentials, on the other hand, are rather weak in the diagonal part of both ΛN and ΣN(I = 3/2) systems.