Abstract
Quantum Chromodynamics (QCD) is well established as theory of strong interactions through a large number of experimental verifications. The era of ‘testing QCD’ is clearly finished, and QCD today is becoming precision physics. In contrast to LEP and SLC, where electroweak reactions could be studied to a highly precise level without having to take QCD effects into account, QCD is ubiquitous at hadron colliders, affecting all observables. Any precision measurement (strong coupling constant, quark masses, electroweak parameters, parton distributions) at the Tevatron and the LHC, as well as any prediction of new physics effects and their backgrounds, relies on the understanding of QCD effects on the observable under consideration.
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