Hyperon-Nucleon Interaction from Lattice QCD at (m_π, m_K) ≈ (146,525) MeV

摘要

Comprehensive study of generalized baryon-baryon (BB) interaction including strangeness is one of the important subject of nuclear physics. In order to obtain a complete set of isospin-base baryon interactions, we perform a large scale lattice QCD calculation with almost physical quark masses corresponding to (mπ, mK) ≈ (146,525) MeV and large volume (La)~4 = (96a)~4 ≈(8.1 fm)~4. A large number of Nambu-Bethe-Salpeter (NBS) correlation functions from nucleon-nucleon (NN) to ΞΞ are calculated simultaneously. In this contribution, we focus on the strangeness S = -1 channels of the hyperon interactions by means of HAL QCD method. Three potentials ((i) the ~1S_0 central, (ii) the ~3S_1 -~3D_1 central, and (iii) ~3S_1 -~3D_1 tensor potentials) are presented for four isospin components; (1) the ΣN - ΣN (the isospin I = 3/2) diagonal, (2) the AN - AN diagonal, (3) the AN → ΣN transition, and (4) the ΣN - ΣN (I = 1/2) diagonal. Scattering phase shifts for ΣN (I = 3/2) system are presented.