Heavy-light meson decay constants with N_f=3

TL;DR

This paper reports on the MILC Collaboration's extended lattice QCD calculations of heavy-light meson decay constants with three dynamical quarks at multiple lattice spacings and quark masses, aiming for precise chiral and continuum extrapolations.

Contribution

It presents new results at a finer lattice spacing and multiple quark mass combinations, enhancing the understanding of decay constants with dynamical quarks.

Findings

Results at 0.09 fm lattice spacing for quenched and dynamical quarks.

Increased statistics and additional quark mass sets at coarser lattice spacing.

Foundation for future decay constant analysis with chiral and continuum extrapolations.

Abstract

During the past year the MILC Collaboration has continued its study of heavy-light meson decay constants with three dynamical quarks. Calculations have been extended to a second lattice spacing of about 0.09 fm. At this lattice spacing, there are results in the quenched approximation and for three sets of dynamical quark mass: m_l=m_s; m_l=0.4 m_s and m_l=0.2 m_s, where m_l is the light mass for the u and d quarks and m_s is the strange quark mass. At the coarser lattice spacing, for which results were presented at Lattice 2001, statistics have been increased for two sets of quark masses and three additional sets of quark masses have been studied, giving a total of eight combinations used to interpolate between the quenched and chiral limits. When these calculations are completed, we can study the decay constants taking into account both chiral and continuum extrapolations.