Semileptonic B to D decays at nonzero recoil with 2+1 flavors of improved staggered quarks. An update

TL;DR

This paper reports on lattice QCD calculations of B to D semileptonic decays at nonzero recoil, aiming to improve tests of CKM matrix unitarity using advanced lattice ensembles and actions.

Contribution

It provides preliminary lattice QCD results for B to D decays at nonzero recoil using 2+1 flavor ensembles with improved actions, advancing precision in CKM tests.

Findings

Preliminary form factor results for B to D decays at nonzero recoil.

Use of MILC 2+1 flavor ensembles with fine lattice spacings.

Application of Fermilab interpretation for heavy quarks.

Abstract

The Fermilab Lattice and MILC collaborations are completing a comprehensive program of heavy-light physics on MILC (2+1)-flavor asqtad ensembles with lattice spacings as small as 0.045 fm and light-to-strange-quark mass ratios as low as 1/20. We use the Fermilab interpretation of the clover action for heavy valence quarks and the asqtad action for the light valence quarks. The central goal of the program is to provide ever more exacting tests of the unitarity of the CKM matrix. We present preliminary results for one part of the program, namely the analysis of the semileptonic decay B -> D l nu at nonzero recoil.