Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-08-30
Phys.Rev. D72 (2005) 114018
Physics
High Energy Physics
High Energy Physics - Phenomenology
53 pages, 9 figures, a few typos fixed
Scientific paper
10.1103/PhysRevD.72.114018
The origin of the breaking of conventional linear k_\perp-factorization for hard processes in a nuclear environment is by now well established. The realization of the nonlinear nuclear k_\perp-factorization which emerges instead was found to change from one jet observable to another. Here we report on an important technical progress, the evaluation of the four-gluon color dipole cross section operator. It describes the coupled seven-channel non-Abelian intranuclear evolution of the four-gluon color-singlet states. An exact diagonalization of this seven-channel problem is possible for large number of colors N_c and allows a formulation of nonlinear k_\perp-factorization for production of gluon-gluon dijets. The momentum spectra for dijets in all possible color representations are reported in the form of explicit quadratures in terms of the collective nuclear unintegrated glue. Our results fully corroborate the concept of universality classes.
Nikolaev Nikolai N.
Schäfer Wolfgang
Zakharov Bronislav G.
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