Hyperon vector coupling f_1(0) from 2+1 flavor lattice QCD

摘要

We present results for the hyperon vector form factor f1 for Ξ~0→Σ+lv-bar and Σ~?→nlv-bar semileptonic decays from dynamical lattice QCD with domain‐wall quarks. Simulations are performed on the 2+1 flavor gauge configurations generated by the RBC and UKQCD Collaborations with a lattice cutoff of a~(?1)? = ?1.7?GeV. Our preliminary results, which are calculated at the lightest sea quark mass (pion mass down to approximately 330 MeV), show that a sign of the second‐order correction of SU(3) breaking on hyperon vector coupling f_1(0) is likely negative.