Fractional Analytic Perturbation Theory in QCD and Exclusive Reactions
Loading...
Date
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Description
Different ``analytization'' procedures for the factorized pion form factor are discussed in comparison with the standard QCD perturbation theory at NLO. It is argued that demanding the analyticity of the exclusive amplitude as a \emph{whole}, entails insensitivity of the results on all scheme and scale-setting parameters, including the factorization scale. This enables us to develop an approach of optimized perturbation theory within the MS-bar scheme and to generalize the Analytic Perturbation Theory to non-integer (fractional) powers of the strong running coupling in the complex Q^2 plane
7 pages, 1 figure, 1 table, needs hsqcd.cls. Invited plenary talk presented by the first author at Hadron Structure and QCD: from Low to High Energies, St. Petersburg, Russia, 20-24 September 2005
7 pages, 1 figure, 1 table, needs hsqcd.cls. Invited plenary talk presented by the first author at Hadron Structure and QCD: from Low to High Energies, St. Petersburg, Russia, 20-24 September 2005