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 (π^2/ ln(Q^2/Lambda^2))^N corrections to α_s (Q^2) that appear owing to the analytic continuation from spacelike to timelike region of momentum transfer.

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

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