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

¹ Research Centre for Nuclear Physics, Osaka University, Osaka, 567-0047, Japan
² Theoretical Research Division, Nishina Centre, RIKEN, Saitama, 351-0198, Japan
³ Centre for Gravitational Physics, Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto, 606-8502, Japan
⁴ Centre for Computational Sciences, University of Tsukuba, Tsukuba 305-8577, Japan
⁵ iTHEMS Program and iTHES Research Group, RIKEN, Saitama, 351-0198, Japan
⁶ Nihon University, College of Bioresource Sciences, Kanagawa 252-0880, Japan

^* Speaker, e-mail: hidekatsu.nemura@rcnp.osaka-u.ac.jp

Published online: 26 March 2018

Abstract

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 ³S₁ − ³ D₁ central, ³S₁ − ³ D₁ tensor, and the ¹S₀ 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.