Axial charges of hyperons and charmed baryons using $N_f=2+1+1$ twisted mass fermions

TL;DR

This study computes the axial charges of hyperons and charmed baryons using lattice QCD with twisted mass fermions, analyzing their dependence on pion mass and SU(3) symmetry breaking effects.

Contribution

It provides the first lattice QCD determination of axial charges for hyperons and charmed baryons with near-physical quark masses using twisted mass fermions.

Findings

Axial couplings depend on pion mass in the studied range.

SU(3) breaking effects are observed as light quark mass approaches physical values.

Results are consistent with theoretical expectations and previous lattice studies.

Abstract

The axial couplings of the low lying baryons are evaluated using a total of five ensembles of dynamical twisted mass fermion gauge configurations. The simulations are performed using the Iwasaki gauge action and two degenerate flavors of light quarks, and a strange and a charm quark fixed to approximately their physical values at two values of the coupling constant. The lattice spacings, determined using the nucleon mass, are $a=0.082$ fm and $a=0.065$ fm and the simulations cover a pion mass in the range of about 210 MeV to 430 MeV. We study the dependence of the axial couplings on the pion mass in the range of about 210 MeV to 430 MeV as well as the $SU(3)$ breaking effects as we decrease the light quark mass towards its physical value.