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

Abstract

We present our recent results of baryon interactions with strangeness $S=-1$ based on Nambu-Bethe-Salpeter (NBS) correlation functions calculated from lattice QCD with almost physical quark masses corresponding to $(m_π,m_K)\approx(146,525)$ MeV and large volume $(La)^4=(96a)^4\approx$ (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 $^3S_1-^3D_1$ central, $^3S_1-^3D_1$ tensor, and the $^1S_0$ central potentials) are presented for the $ΣN - ΣN$ (the isospin $I=3/2$) diagonal, the $ΛN - ΛN$ diagonal, the $ΛN \rightarrow ΣN$ transition, and the $ΣN - ΣN$ ($I=1/2$) diagonal interactions. Scattering phase shifts for $ΣN$ $(I=3/2)$ system are presented.

Talk presented at the 35th International Symposium on Lattice Field Theory (Lattice 2017), 18-24 June 2017, Granada, Spain, 8 pages, 17 figures, references added, typos corrected, arXiv admin note: text overlap with arXiv:1702.00734