Axial vector form factors in Ds to phi semileptonic decays from lattice QCD

Abstract

We calculate axial vector and vector form factors for the semileptonic decay Ds to phi using HISQ valence quarks on MILC ensembles with 2+1 flavours of asqtad sea quarks. Using twisted boundary conditions to tune the quarks' momenta, we compute form factors at q^2 = 0 on coarse lattices. We find V(0)=0.903(67), A_1(0)= 0.603(20), A_2(0)=0.401(80) and A_0(0)=0.686(17), which we compare to experimental data and previous quenched lattice QCD calculations.

7 pages, 3 figures.Contribution to the XXIX International Symposium on Lattice Field Theory - Lattice 2011, July 2011, Squaw Valley, Lake Tahoe, California