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 q2 = 0 on coarse lattices. We find V(0)=0.903(67), A1(0)= 0.603(20), A2(0)=0.401(80) and A0(0)=0.686(17), which we compare to experimental data and previous quenched lattice QCD calculations.
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