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We investigate the interaction between baryons in the 1S0 channel from 2+1-flavor lattice quantum chromodynamics (QCD) simulations. On the basis of the HAL QCD method, the potential is extracted from the Nambu–Bethe–Salpeter wave function calculated on the
lattice by using the PACS-CS gauge configurations with a lattice spacing of a 0.09 fm, a lattice volume of L 2.9 fm, and quark masses corresponding to mπ 700MeV and m 1970MeV. The potential has a repulsive core at short distances and an attractive well at intermediate distances. Accordingly, the phase shift obtained from the potential shows moderate attraction at low energies. Our data indicate that the system with the present quark masses
may appear close to the unitary limit where the scattering length diverges.
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