NONLINEAR k_\perp-FACTORIZATION FOR FORWARD DIJETS IN DEEP INELASTIC SCATTERING OFF NUCLEI IN THE SATURATION REGIME
Nikolaev N.N., Schafer W., Zakharov B.G., Zoller V.R.

Received: March 11, 2003

PACS: 12.38.Aw, 13.87.Ce, 24.85.+p, 25.75.Gz

DJVU (303.7K)

PDF (662.7K)

We develop a 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 the nuclear medium. We report a nonlinear \perp-factorization formula for the breakup of photons into dijets in terms of the collective Weizsacker-Williams glue of nuclei defined in [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 Q_A. For minijets with the transverse momentum below the saturation scale, the nonlinear -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.