Nonlinear kT factorization for Forward Dijets in DIS off Nuclei in the Saturation Regime

Details Nonlinear kT factorization for Forward Dijets in DIS off Nuclei in the Saturation Regime Nonlinear kT factorization for Forward Dijets in DIS off Nuclei in the Saturation Regime

2003-03-04

arxiv.org/abs/hep-ph/0303024v1

J.Exp.Theor.Phys. 97 (2003) 441-465; Zh.Eksp.Teor.Fiz. 124 (2003) 491-515

Physics

High Energy Physics

High Energy Physics - Phenomenology

40 pages, 7 figures

Scientific paper

10.1134/1.1618332

We develop the QCD description of the breakup of photons into forward dijets in small-x deep inelastic scattering off nuclei in the saturation regime. Based on the color dipole approach, we derive a multiple scattering expansion for intranuclear distortions of the jet-jet transverse momentum spectrum. A special attention is paid to the non-Abelian aspects of the propagation of color dipoles in a nuclear medium. We report a nonlinear $k_{\perp}$-factorization formula for the breakup of photons into dijets in terms of the collective Weizs\"acker-Williams (WW) glue of nuclei as defined in ref. \cite{Saturation,NSSdijet}. For hard dijets with the transverse momenta above the saturation scale the azimuthal decorrelation (acoplanarity) momentum is of the order of the nuclear saturation momentum QA. For minijets with the transverse momentum below the saturation scale the nonlinear kT-factorization predicts a complete disappearance of the jet-jet correlation. We comment on a possible relevance of the nuclear decorrelation of jets to the experimental data from the STAR-RHIC Collaboration.

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