Hyperon vector form factor from 2+1 flavor lattice QCD

Abstract

We present the first result for the hyperon vector form factor f_1 for Xi^0 -> Sigma^+ l bar{nu} and Sigma^- -> n l bar{nu} 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 beta=2.13, corresponding to a cutoff 1/a=1.73 GeV. Our results, which are calculated at the lighter three sea quark masses (the lightest pion mass down to approximately 330 MeV), show that a sign of the second-order correction of SU(3) breaking on the hyperon vector coupling f_1(0) is negative. The tendency of the SU(3) breaking correction observed in this work disagrees with predictions of both the latest baryon chiral perturbation theory result and large N_c analysis.

7 pages, 12 figures, v2: typos corrected, and references added, v3: version published in PRD

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• Octet-baryon axial-vector charges and SU(3)-breaking effects in the semileptonic hyperon decays
• Recent developments in SU(3) covariant baryon chiral perturbation theory
• Non-standard semileptonic hyperon decays
• Hyperon Semileptonic decay constants with flavor SU(3) symmetry breaking
• Testing SU(3) Flavor Symmetry in Semileptonic and Two-body Nonleptonic Decays of Hyperons
• Hyperon semileptonic decays in QCD sum rules
• The baryon vector current in the combined chiral and 1/Nc expansions
• Continuum limit of hyperon vector coupling $f_1(0)$ from 2+1 flavor domain wall QCD
• SU(3) breaking in hyperon transition vector form factors
• Chiral Effective Theory Methods and their Application to the Structure of Hadrons from Lattice QCD
• Chiral extrapolation and finite-volume dependence of the hyperon vector couplings
• Patterns of flavour symmetry breaking in hadron matrix elements involving u, d and s quarks
• Accessing high-momentum nucleons with dilute stochastic sources
• Effect of isoscalar and isovector scalar fields on baryon semileptonic decays in nuclear matter
• The effects of flavour symmetry breaking on hadron matrix elements
• Baryons and baryoniums in the perspective of QCD sum rules