First Calculation of Hyperon Axial Couplings from Lattice QCD

Abstract

In this work, we report the first lattice calculation of hyperon axial couplings, using the 2+1-flavor MILC configurations and domain-wall fermion valence quarks. Both the $\Sigma$ and $\Xi$ axial couplings are computed for the first time in lattice QCD. In particular we find that $g_{\Sigma \Sigma }=0.450(21{)}_{\mathrm{stat}}(27{)}_{\mathrm{syst}}$ and $g_{\Xi \Xi }=-0.277(15{)}_{\mathrm{stat}}(19{)}_{\mathrm{syst}}$.

Comments: 5 pages, 2 figures