Title
Instanton effects in quark form factor and quark-quark scattering at high energyInstanton effects in quark form factor and quark-quark scattering at high energy
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
New York,
Subject
Physics
Source (journal)
Annals of physics. - New York
Volume/pages
314(2004):2, p. 321-361
ISSN
0003-4916
ISI
000226041300002
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
The nonperturbative effects in the high-energy processes involving strongly interacting particles are studied within the instanton liquid model of the QCD vacuum (ILM) by using the Wilson integral framework. The detailed analysis of nonperturbative contributions to the electromagnetic quark form factor is presented considering the structure of the instanton-induced effects in the evolution equation describing the high energy behavior of the form factor. It is shown that the instantons yield in high energy limit the logarithmic corrections to the amplitudes which are exponentiated in small instanton density parameter. By using the Gaussian interpolation of the constrained instanton solution, we show that the all-order multi-instanton contribution is well approximated by the weak field limit result. The role of the instantons in high energy diffractive quark-quark scattering, in particular, in formation of the soft Pomeron, is also considered. We show that within the ILM the C-odd diffractive amplitude is suppressed as 1/s compared to the C-even one. The further applications of the developed approach in studying the nonperturbative effects in high energy hadronic processes are briefly discussed. (C) 2004 Elsevier Inc. All rights reserved.
E-info
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