We report the current status of hyperon vector couplings f1(0) in 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 two couplings, β = 2.13 and 2.25. Our results show that signs of the second-order corrections of SU(3) breaking on the hyperon vector couplings in Σ- →nl νl and Ξ0 →Σ+lvl semileptonic decays are negative at simulated pion masses of Mπ=330-558 MeV. The size of the second-order corrections is comparable to what was observed in lattice calculations of kaon semileptonic decays. We also evaluate the systematic uncertainty on f1(0) due to the lattice discretization error.
|Proceedings of Science
|Published - 2013
|31st International Symposium on Lattice Field Theory, LATTICE 2013 - Mainz, Germany
Duration: 2013 Jul 29 → 2013 Aug 3