Study of instanton effects in electromagnetic quark form factor at high energy

Details Study of instanton effects in electromagnetic quark form factor at high energy Study of instanton effects in electromagnetic quark form factor at high energy

2004-11-30

arxiv.org/abs/hep-ph/0411384v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Presented at the Diffraction 2004, Cala Gonone, Sardinia, Italy; Sept 18-23, 2004; to appear in the Proceedings. 3 pp

Scientific paper

10.1016/j.nuclphysbps.2005.02.07

The detailed analysis of nonperturbative contributions to the electromagnetic quark form factor is performed within the framework of the instanton liquid model (ILM) of the QCD vacuum. The method of the path-ordered Wilson exponentials is applied to evaluate explicitly the instanton corrections. By using the Gaussian interpolation of the constrained instanton solution, it is shown that the instantons yield the logarithmic corrections to the amplitudes in high energy limit which are exponentiated in small instanton density parameter.

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