Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-05-06
Surveys High Energ.Phys. 18 (2003) 205-220
Physics
High Energy Physics
High Energy Physics - Phenomenology
REVTeX, 12 pages, 1 figure. Important references and discussions added, misprints corrected, minor changes in text
Scientific paper
10.1080/01422410310001610392
The analysis of nonperturbative effects in high energy asymptotics of the electomagnetic quark form factor is presented. It is shown that the nonperturbative effects determine the initial value for the perturbative evolution of the quark form factor and find their general structure with respect to the high energy asymptotics. Within the Wilson integral formalism which is natural for investigation of the soft, IR sensitive, part of the factorized form factor, the structure of the instanton induced effects in the evolution equation is discussed. It is demonstrated that the instanton contributions result in the finite renormalization of the subleading perturbative result and numerically are characterized by small factor reflecting the diluteness of the QCD vacuum within the instanton liquid model. The relevance of the IR renormalon induced effects in high energy asymptotic behaviour is discussed. The consequences of the various analytization procedures of the strong coupling constant in the IR domain are considered.
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