ΛΛ and N Ξ interactions from lattice QCD near the physical point

The S-wave Lambda Lambda and N Xi interactions are studied on the basis of the (2+1)-flavor lattice QCD simulations close to the physical point (m(pi) similar or equal to 146 MeV and m(K) similar or equal to 525MeV). Lattice QCD potentials in four different spin-isospin channels are extracted by using the coupled-channel HAL QCD method and are parametrized by analytic functions to calculate the scattering phase shifts. The Lambda Lambda interaction at low energies shows only a weak attraction, which does not provide a bound or resonant dihyperon. The N Xi interaction in the spin-singlet and isospin-singlet channel is most attractive and lead the N Xi system near unitarity. Relevance to the strangeness = -2 hypernuclei as well as to two-baryon correlations in proton-proton, proton-nucleus and nucleus-nucleus collisions is also discussed. (C) 2020 Elsevier B.V. All rights reserved.