Hyperon vector form factor from 2+1 flavor lattice QCD

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17 Citations (Scopus)

Abstract

We present the first result for the hyperon vector form factor f 1 for Ξ0→Σ+lν̄ and Σ-→nlν̄ 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=1.73GeV. 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 f1(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 Nc analysis.

Original languageEnglish
Article number114502
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume86
Issue number11
DOIs
Publication statusPublished - 2012 Dec 3

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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