Quartic mass corrections to R_had at order α_s^3

Abstract

The total cross section for the production of massive quarks in electron positron annihilation can be predicted in perturbative QCD. After expansion in m^2/s the quartic terms, i.e. those proportional to m^4/s^2, are calculated up to order α_s^3 for vector and axial current induced rates. Predictions relevant for charm, bottom and top quarks production are presented. The α_s^3 corrections are shown to be comparable to terms of order α_s and α_s^2. As a consequence, the predictions exhibit a sizeable dependence on the renormalization scale. The stability of the prediction is improved and, at the same time, the relative size of the large order terms decreases by replacing the running mass \bar{m}(μ) with the scheme independent invariant one \hat{m}. By combining these results with the prediction for massless case and the quadratic mass terms the cross section for massive quark production at electron positron colliders is put under control in order α_s^3 from the high energy region down to fairly low energies.

LaTeX, 20 pages, 9 figures (38 PostScript files). Error affecting Eqs. (9), (10) and Table 2 corrected. The numerical effect of this error is negligible and not visible in any of the Figures. The paper is also available via www at http://www-ttp.physik.uni-karlsruhe.de/Preprints/. The results are available in Mathematica format at http://www-ttp.physik.uni-karlsruhe.de/Progdata/ttp00/ttp00-09/

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