Instanton Corrections to Quark Form Factor at Large Momentum Transfer

Details Instanton Corrections to Quark Form Factor at Large Momentum Transfer Instanton Corrections to Quark Form Factor at Large Momentum Transfer

2002-12-24

arxiv.org/abs/hep-ph/0212357v5

Phys.Rev. D67 (2003) 114017

Physics

High Energy Physics

High Energy Physics - Phenomenology

Version coincident with the journal publication, 9 pages; REVTeX

Scientific paper

10.1103/PhysRevD.67.114017

Within the Wilson integral formalism, we discuss the structure of nonperturbative corrections to the quark form factor at large momentum transfer analyzing the infrared renormalon and instanton effects. We show that the nonperturbative effects determine the initial value for the perturbative evolution of the quark form factor and attribute their general structure to the renormalon ambiguities of the perturbative series. It is demonstrated that the instanton contributions result in the finite renormalization of the next-to-leading perturbative result and numerically are characterized by a small factor reflecting the diluteness of the QCD vacuum within the instanton liquid model.

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