$B_s\to D_s^{(*)}l\nu$ Form Factors with Heavy HISQ Quarks

TL;DR

This paper reports progress on calculating $B_s o D_s^{(*)} l u$ form factors using HISQ quarks on MILC ensembles, with multiple $b$ quark masses and lattice spacings to enable physical extrapolation.

Contribution

It introduces a method to compute $B_s o D_s^{(*)} l u$ form factors with HISQ quarks across various lattice spacings and quark masses for accurate physical predictions.

Findings

Progress in form factor calculations on MILC ensembles.

Use of multiple $b$ quark masses for extrapolation.

Application of HISQ action for all valence quarks.

Abstract

We present progress on an ongoing calculation of the $B_s\to D_s^{(*)} l \nu$ form factors calculated on the $n_f=2+1+1$ MILC ensembles and using the Highly Improved Staggered Quark action for all valence quarks. We perform the calculation at a range of $b$ quark masses (and lattice spacings) so that we can extrapolate to the physical $b$-quark mass.