Journal
PHYSICS LETTERS B
Volume 515, Issue 1-2, Pages 49-56Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0370-2693(01)00857-7
Keywords
lattice QCD; dynamical fermions; running coupling; renormalization
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We report on the non-perturbative computation of the running coupling of two-flavour QCD in the Schrodinger functional scheme. The corresponding A-parameter, which describes the coupling strength at high energy, is related to a low energy scale which still remains to be connected to a hadronic experimentally observable quantity. We find the non-perturbative evolution of the coupling important to eliminate a significant contribution to the total error in the estimated A-parameter. (C) 2001 Elsevier Science B.V. All rights reserved.
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