Optimized Lambda-Parametrization for the QCD Running Coupling Constant in Spacelike and Timelike Regions

Abstract

The algorithm is described that enables one to perform an explicit summation of all the (\pi^2/ ln(Q^2/Lambda^2))^N corrections to \alpha_s (Q^2) that appear owing to the analytic continuation from spacelike to timelike region of momentum transfer.

Comments: 6 pages, LaTeX. Old preprint with a couple of comments added