Baryon interactions from lattice QCD with physical masses — strangeness S = -1 sector —

We present our recent results of baryon interactions with strangeness S = −1 based on Nambu-Bethe-Salpeter (NBS) correlation functions calculated fromlattice QCD with almost physical quark masses corresponding to ( m k ,m k ) ≈ (146, 525) MeV and large volume ( La ) 4 ≈ ( 96a ) 4 ≈ (8.1 fm) 4 . In order to perform a comprehensive study of baryon interactions, a large number of NBS correlation functions from NN to ΞΞ are calculated simultaneously by using large scale computer resources. In this contribution, we focus on the strangeness S = −1 channels of the hyperon interactions by means of HAL QCD method. Four sets of three potentials (the 3 S 1 − 3 D 1 central, 3 S 1 − 3 D 1 tensor, and the 1 S 0 central potentials) are presented for the ∑ N − ∑ N (the isospin I = 3/2) diagonal, the ∧ N − ∧ N diagonal, the ∧ N → ∑ N transition, and the ∑ N − ∑ N ( I = 1/2) diagonal interactions. Scattering phase shifts for ∑ N ( I = 3/2) system are presented.