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 $g_{\Xi \Xi }=-0.277(15{)}_{\mathrm{stat}}(19{)}_{\mathrm{syst}}$.

5 pages, 2 figures

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• SU(2) Low-Energy Constants from Mixed-Action Lattice QCD
• Evidence for non-analytic light quark mass dependence in the baryon spectrum
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• Axial form factors of the octet baryons in a covariant quark model
• SU(3)-flavour breaking in octet baryon masses and axial couplings
• Baryon Octet Electromagnetic Form Factors in a confining NJL model
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• Pseudoscalar-Meson Octet-Baryon Coupling Constants from two-flavor Lattice QCD