Hyperon-nucleon force from lattice QCD

We calculate potentials between a proton and a Xi(0) (hyperon with strangeness -2) through the equal-time Bethe-Salpeter wave function. employing quenched lattice QCD simulations with the plaquette gauge action and the Wilson quark action on (4.5 fm)(4) lattice at the lattice spacing a similar or equal to 0.14 fill. The ud quark mass in our Study corresponds to m(pi) similar or equal to 0.37 and 0.51 GeV, while the s quark mass corresponds to the physical value of m(K). The central p Xi(0) potential has a strong (weak) repulsive core in the S-1(0) (S-3(1)) channel for r less than or similar to 0.6 fm, while the potential has attractive well at medium and long distances (0.6 fm less than or similar to r less than or similar to 1.2 fm) in both channels. The sign of the p Xi(0) scattering length and its quark mass dependence indicate a net attraction in both channels at low energies. (C) 2009 Published by Elsevier B.V.