High-precision lattice QCD confronts experiment.
The recently developed Symanzik-improved staggered-quark discretization allows unquenched lattice-QCD simulations with much smaller (and more realistic) quark masses than previously possible. To test this formalism, we compare experiment with a variety of nonperturbative calculations in QCD drawn from a restricted set of "gold-plated" quantities. We find agreement to within statistical and systematic errors of 3% or less. We discuss the implications for phenomenology and, in particular, for heavy-quark physics.
Davies
C T H
CT
Department of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
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Gray
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Wingate
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Gottlieb
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Gregory
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