出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We calculate axial vector and vector form factors for the semileptonic decay Ds !f using HISQ valence quarks onMILC 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.
