Fundamental parameters of QCD
Rainer Sommer, Hartmut Wittig
Abstract
The theory of strong interactions, QCD, is described in terms of a few parameters, namely the strong coupling constant alphas and the quark masses. We show how these parameters can be determined reliably using computer simulations of QCD on a space-time lattice, and by employing a finite-size scaling method, which allows to trace the energy dependence of alphas and quark masses over several orders of magnitude. We also discuss methods designed to reduce the effects of finite lattice spacing and address the issue of computer resources required.
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