Paul B. Mackenzie

TL;DR: In this article, the authors present a new method for resolving the scheme-scale ambiguity that has plagued perturbative analyses in quantum chromodynamics and other gauge theories, which reduces to the standard criterion that only vacuum-polarization insertions contribute to the effective coupling constant.

TL;DR: It is shown that the apparent failure of QCD lattice perturbation theory to account for Monte Carlo measurements of perturbative quantities results from choosing the bare lattice coupling constant as the expansion parameter, and a new prescription for designing lattice operators that are more continuumlike than conventional operators is suggested.

TL;DR: In this article, the improved staggered quark formalism (asqtad fermions) has been used to simulate full quantum chromodynamics (QCD) on the lattice, with two degenerate flavors of light quarks and one heavier quark.

TL;DR: In this paper, a formulation of lattice fermions applicable to all quark masses, large and small, was presented, and the couplings in improved actions were obtained for arbitrary fermion mass m{sub q, without expansions around small-or large-mass limits.

TL;DR: To test the Symanzik-improved staggered-quark discretization formalism, experiment with a variety of nonperturbative calculations in QCD drawn from a restricted set of "gold-plated" quantities finds agreement to within statistical and systematic errors of 3% or less.