Heavy-light decay constants using clover valence quarks and three flavors of dynamical improved staggered quarks

TL;DR

This paper reports on lattice QCD calculations of heavy-light meson decay constants using clover valence quarks on three-flavor improved staggered quark ensembles, with improved statistics and renormalization data.

Contribution

It presents new results for decay constants of B and D mesons using updated data and perturbative renormalization, enhancing previous calculations.

Findings

Increased statistics on fine ensembles.

Preliminary perturbative renormalization of axial-vector current.

Results for f_B, f_{B_s}, f_D, and f_{D_s} in MeV.

Abstract

Starting in 2001, the MILC Collaboration began a large scale calculation of heavy-light meson decay constants using clover valence quarks on ensembles of three flavor configurations. For the coarse configurations, with a=0.12 fm, eight combinations of dynamical light and strange quarks have been analyzed. For the fine configurations, with a=0.09 fm, three combinations of quark masses are studied. Since we last reported on this calculation, statistics have been increased on the fine ensembles, and, more importantly, a preliminary value for the perturbative renormalization of the axial-vector current has become available. Thus, results for f_B, f_{B_s}, f_D and f_{D_s} can, in principle, be calculated in MeV, in addition to decay-constant ratios that were calculated previously.