Quark mass effects to σ(e^+e^- -> hadrons) at O(α_s^3)
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The calculation of the quartic mass terms at order α_s^3 to the hadronic R ratio is described. It is based on the operator product expansion for the quark current correlator, combined with an application of the renormalization group equation.
Latex, 3+2 pages, 10 ps-files included. Talk presented by R.H. at the International Europhysics Conference on High Energy Physics (EPS-HEP99), Tampere, Finland, July 15-21, 1999. The paper, with figures, is also available via anonymous ftp at ftp://ttpux2.physik.uni-karlsruhe.de/ttp99/ttp99-42/ or via www at http://www-ttp.physik.uni-karlsruhe.de/Preprints/
Latex, 3+2 pages, 10 ps-files included. Talk presented by R.H. at the International Europhysics Conference on High Energy Physics (EPS-HEP99), Tampere, Finland, July 15-21, 1999. The paper, with figures, is also available via anonymous ftp at ftp://ttpux2.physik.uni-karlsruhe.de/ttp99/ttp99-42/ or via www at http://www-ttp.physik.uni-karlsruhe.de/Preprints/