A. V. Nesterenko, S. A. Popov
Published 2016-08-15Version 1
High-energy behavior of R-ratio of electron-positron annihilation into hadrons is studied. In particular, it is argued that at any given order of perturbation theory the re-expansion of the R-ratio in the ultraviolet asymptotic can be reduced to the form of power series in the naive continuation of the strong running coupling into the timelike domain. The convergence range of the re-expanded R-ratio and the corresponding higher-order pi2-terms are discussed.
Comments: Based on talks given at the 14th Workshop on Nonperturbative QCD (13 - 16 June 2016, Paris, France) and the 19th International QCD Conference (QCD 16) (4 - 8 July 2016, Montpellier, France); 5 pages, 3 figures
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