Expansion Techniques in Massive Quark Production: Results and Applications
Abstract
Description
Recent progress in the calculation of multi-loop, multi-scale diagrams is reviewed. Expansion techniques combined with new developments in Computer algebra allow to evaluate the R ratio for massive quarks up to order $α_s^2$ and, partly, even $α_s^3$. Similar techniques can be applied to Higgs- or Z-boson decays and mixed QCD and electroweak interactions.
21 pages, 15 figures. Presented at the 4th International Symposium on Radiative Corrections (RADCOR 98), Barcelona, 8-12 Sep 1998, to appear in the proceedings. The complete paper is also available via anonymous ftp at ftp://ttpux2.physik.uni-karlsruhe.de/ttp99/ttp99-01/ or via www at http://www-ttp.physik.uni-karlsruhe.de/Preprints
21 pages, 15 figures. Presented at the 4th International Symposium on Radiative Corrections (RADCOR 98), Barcelona, 8-12 Sep 1998, to appear in the proceedings. The complete paper is also available via anonymous ftp at ftp://ttpux2.physik.uni-karlsruhe.de/ttp99/ttp99-01/ or via www at http://www-ttp.physik.uni-karlsruhe.de/Preprints