$B_{(s)}\to D_{(s)}$ semileptonic decays with NRQCD-HISQ valence quarks

TL;DR

This paper calculates the form factors for $B_{(s)} o D_{(s)}$ semileptonic decays using lattice QCD with NRQCD and HISQ quarks, providing key data for understanding these processes.

Contribution

It presents the first comprehensive lattice QCD calculation of $f_0$ and $f_+$ form factors for these decays with multiple quark mass and momentum transfer values.

Findings

Form factors $f_0$ and $f_+$ obtained at four $q^2$ points.

Chiral-continuum extrapolated results provided.

Results useful for phenomenology and CKM matrix studies.

Abstract

We present a calculation of the form factors, $f_0$ and $f_+$, for the $B_{(s)} \to D_{(s)}$ semileptonic decays. Our work uses the MILC $n_f=2+1$ AsqTad configurations with NRQCD and HISQ valence quarks at four values of the momentum transfer $q^2$. We provide results for the chiral-continuum extrapolations of the scalar and vector form factors.