High-Precision Lattice QCD Confronts Experiment
C. T. H. Davies, E. Follana, A. Gray, G. P. Lepage, Q. Mason, M., Nobes, J. Shigemitsu, H. D. Trottier, M. Wingate, C. Aubin, C. Bernard, T., Burch, C. DeTar, Steven Gottlieb, E. B. Gregory, U. M. Heller, J. E. Hetrick,, J. Osborn, R. Sugar, D. Toussaint, M. Di Pierro
TL;DR
This paper demonstrates that high-precision lattice QCD calculations now match experimental results within 3%, thanks to a new improved discretization, and provides a new determination of the strong coupling constant.
Contribution
The paper introduces a new improved staggered quark discretization enabling high-precision lattice QCD calculations that agree with experiment within 3% and offers a new value for alpha_s(Mz).
Findings
Lattice QCD calculations now agree with experiment within 3%.
A new determination of alpha_s(Mz) as 0.121(3).
Implications for heavy-quark physics and phenomenology.
Abstract
We argue that high-precision lattice QCD is now possible, for the first time, because of a new improved staggered quark discretization. We compare a wide variety of nonperturbative calculations in QCD with experiment, and find agreement to within statistical and systematic errors of 3% or less. We also present a new determination of alpha_msbar(Mz); we obtain 0.121(3). We discuss the implications of this breakthrough for phenomenology and, in particular, for heavy-quark physics.
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