Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-08-22
Rev.Mod.Phys. 68 (1996) 259-303
Physics
High Energy Physics
High Energy Physics - Phenomenology
83 pages, LaTeX, Reviews of Modern Physics style, 14 figures plus figural equations (not included). Hard copy available upon r
Scientific paper
10.1103/RevModPhys.68.259
A summary of the current understanding of methods of analytical higher order perturbative computations of total cross sections and decay widths in Quantum Chromodynamics is presented. As examples, the total cross section in electron positron annihilation, the hadronic decay rates of the tau lepton and Higgs boson up to O(\alpha_s^2) and O(\alpha_s^3) are considered. The evaluation of the four-loop QED \beta - function at an intermediate step of the calculation is briefly described. The problem of renormalization group ambiguity of perturbative results is considered and some of the existing prescriptions are discussed. The problem of estimation of theoretical uncertainty in perturbative calculations is briefly discussed.
Samuel Mark A.
Surguladze Levan R.
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