Bass, S. D.Crewther, R. J.Steffens, F. M.Thomas, A.2014-05-202014-05-202006-03-09Physics Letters B. Amsterdam: Elsevier B.V., v. 634, n. 2-3, p. 249-254, 2006.0370-2693http://hdl.handle.net/11449/23552Scale-invariant running couplings are constructed for several quarks being decoupled together, without reference to intermediate thresholds. Large-momentum scales can also be included. The result is a multi-scale generalization of the renormalization group applicable to any order. Inconsistencies in the usual decoupling procedure with a single running coupling can then be avoided, e.g., when cancelling anomalous corrections from t, b quarks to the axial charge of the proton. (c) 2006 Elsevier B.V. All rights reserved.249-254engrenormalization groupthresholdsmass logarithmsmatching conditionsaxial anomalyArtigo10.1016/j.physletb.2006.01.064WOS:000235859800027Acesso restrito