QCD Decoupling at Four Loops
High Energy Physics - Phenomenology
2008-11-26 v1
Abstract
We present the matching condition for the strong coupling contant alpha_s at a heavy quark threshold to four loops in the modified minimal subtraction scheme. Our results lead to further decrease of the theoretical uncertainty of the evolution of the strong coupling constant through heavy quark thresholds. Using a low energy theorem we furthermore derive the effective coupling of the Higgs boson to gluons (induced by a virtual heavy quark) in four- and (partially) through five-loop approximation.
Cite
@article{arxiv.hep-ph/0512060,
title = {QCD Decoupling at Four Loops},
author = {K. G. Chetyrkin and J. H. Kühn and C. Sturm},
journal= {arXiv preprint arXiv:hep-ph/0512060},
year = {2008}
}
Comments
21 pages, 2 figures, the complete paper is also available via the www at http://www-ttp.physik.uni-karlsruhe.de/Preprints/