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https://hdl.handle.net/2440/17572
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Type: | Conference paper |
Title: | Decoupling heavy particles simultaneously |
Author: | Crewther, R. Bass, S. Steffens, F. Thomas, A. |
Citation: | Nuclear Physics B-Proceedings Supplements, 2005; 141:159-164 |
Publisher: | Elsevier Science BV |
Publisher Place: | PO Box 211 Amsterdam Netherlands 1000 AE |
Issue Date: | 2005 |
ISSN: | 0920-5632 |
Conference Name: | QCD Down Under. Workshop on Quantum Chromodynamics (2005) |
Editor: | Brodsky, S. de Wit, B. Parisi, G. Schwimmer, A. Veneziano, G. Weinberg, S. |
Statement of Responsibility: | R.J. Crewther, S.D. Bass, F.M. Steffens and A.W. Thomas |
Abstract: | The renormalization group is extended to cases where several heavy particles are decoupled at the same time. This involves large logarithms which are scale-invariant and so cannot be eliminated by a change of renormalization scheme. A set of scale-invariant running couplings, one for each heavy particle, is constructed without reference to intermediate thresholds. The entire heavy-quark correction to the axial charge of the weak neutral current is derived to next-to-leading order, and checked in leading order by evaluating diagrams explicitly. The mechanism for cancelling contributions from the top and bottom quarks in the equal-mass limit is surprisingly non-trivial. |
Description: | Copyright © 2004 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.nuclphysbps.2004.12.024 |
Description (link): | http://www.elsevier.com/wps/find/journaldescription.cws_home/505717/description#description |
Published version: | http://dx.doi.org/10.1016/j.nuclphysbps.2004.12.024 |
Appears in Collections: | Aurora harvest 6 Special Research Centre for the Subatomic Structure of Matter publications |
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