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We report updated results of the hyperon vector form factor f1 for Ξ0 → Σ+ and Σ− → n semileptonic decays from fully-dynamical lattice QCD. The calculations are carried out with gauge configurations generated by the RBC and UKQCD Collaborations with (2+1)-flavors of dynamical domain-wall fermions and the Iwasaki gauge action at β = 2.13, corresponding to a cutoff a−1 = 1.73 GeV. Our results, which are calculated at the lightest two sea quark masses (pion mass down to approximately 330 MeV), show that a sign of the second-order correction of SU(3) breaking on hyperon vector coupling f1(0) is likely negative. The tendency of the SU(3) breaking correction observed in this work disagrees predictions of both the latest baryon chiral perturbation theory result and large Nc analysis.

Hyperon vector form factors with 2+1 flavor dynamical domain-wall fermions.