Running couplings for the simultaneous decoupling of heavy quarks

Details Running couplings for the simultaneous decoupling of heavy quarks Running couplings for the simultaneous decoupling of heavy quarks

2005-07-25

arxiv.org/abs/hep-ph/0507278v2

Phys.Lett.B634:249-254,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 1 figure, version to appear in PLB. Pages 8-11 and Fig. 1 are new, with consequent changes to the abstract, page 2,

Scientific paper

10.1016/j.physletb.2006.01.064

Scale-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.

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