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

TL;DR

This paper computes the axial vector and vector form factors for the semileptonic decay Ds to phi using lattice QCD, providing results at q^2=0 and comparing them with experimental data and previous calculations.

Contribution

It presents new lattice QCD calculations of form factors for Ds to phi decay using HISQ valence quarks and twisted boundary conditions, improving precision and comparison with experiments.

Findings

Calculated form factors at q^2=0: V(0)=0.903(67), A_1(0)=0.603(20), A_2(0)=0.401(80), A_0(0)=0.686(17)

Results are consistent with experimental data and previous quenched lattice calculations.

Used twisted boundary conditions to accurately tune quark momenta.

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.