Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-06-23
Phys.Rev.D80:074023,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, 10 figures; v3: new plots added showing our model predictions for charm and longitudinal structure functions and p
Scientific paper
10.1103/PhysRevD.80.074023
We show that HERA data for the inclusive structure function F_2(x,Q^2) at small Bjorken-x and Q^2 can be reasonably well described by a color-dipole model with an AdS/CFT-inspired dipole-proton cross section. The model contains only three free parameters fitted to data. In our AdS/CFT-based parameterization the saturation scale varies in the range of 1-3 GeV becoming independent of energy/Bjorken-x at very small x. This leads to the prediction of x-independence of the F_2 and F_L structure functions at very small x. We provide predictions for F_2 and F_L in the kinematic regions of future experiments. We discuss the limitations of our approach and its applicability region, and argue that our AdS/CFT-based model of non-perturbative physics could be viewed as complimentary to the perturbative description of data based on saturation/Color Glass Condensate physics.
Kovchegov Yuri V.
Lu Zhun
Rezaeian Amir H.
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