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

We present results for the hyperon vector form factor f_1 for $Ξ^0 \rightarrow Σ^+ l\barν$ and $Σ^- \rightarrow n l\barν$ 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 1/a = 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.