Towards Lattice QCD Baryon Forces at the Physical Point: First Results

Lattice QCD calculations of baryon forces are performed for the first time with (almost) physical quark masses. $N_f=2+1$ dynamical clover fermion gauge configurations are generated at the lattice spacing of $a\simeq 0.085$ fm on a $(96a{)}^4\simeq (8.2\mathrm{f}\mathrm{m}{)}^4$ lattice with quark masses corresponding to $(m_{\pi },m_K)\simeq (146,525)$ MeV. Baryon forces are calculated using the time-dependent HAL QCD method. In this report, we study $\mathrm{\Xi }\mathrm{\Xi }$ and $NN$ systems both in ${}^1{S}_0$ and ${}^3{S}_1$-${}^3{D}_1$ channels, and the results for the central and tensor forces as well as phase shifts in the $\mathrm{\Xi }\mathrm{\Xi }$ ${(}^1{S}_0)$ channel are presented.