QCD-Instantons and Saturation at Small x

Details QCD-Instantons and Saturation at Small x QCD-Instantons and Saturation at Small x

2003-01-21

arxiv.org/abs/hep-ph/0301177v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 2 figures, presented at the Workshop on Strong and Electroweak Matter (SEWM 2002), October 2-5, 2002, Heidelberg, Ger

Scientific paper

We briefly report on the contribution of QCD-instantons to the phenomenon of saturation in deep-inelastic scattering (DIS) at small Bjorken-x. The explicitly known instanton gauge field serves as a concrete realization of an underlying non-perturbative saturation mechanism associated with strong classical fields. Two independent strategies were pursued, with consistent results: On the one hand, an approach starting from instanton-perturbation theory was considered and on the other hand, the scattering of a Wilson loop in an instanton gauge field background. In both cases, the conspicuous, intrinsic instanton size scale ~ 0.5 fm, as known from the lattice, turns out to determine the saturation scale.

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