Universality of Unintegrated Gluon Distributions at small x

Details Universality of Unintegrated Gluon Distributions at small x Universality of Unintegrated Gluon Distributions at small x

2011-01-04

arxiv.org/abs/1101.0715v2

Phys.Rev.D83:105005,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

42 pages and 13 figures;v2

Scientific paper

10.1103/PhysRevD.83.105005

We systematically study dijet production in various processes in the small-$x$ limit and establish an effective $k_t$-factorization for hard processes in a system with dilute probes scattering on a dense target. We find that the well-known Weizs\"{a}cker-Williams gluon distribution can be directly probed in the quark-antiquark jet correlation in deep inelastic scattering and the dipole gluon distribution can be directly measured in the direct photon-jet correlation in $pA$ collisions. In the large-$N_c$ limit, the unintegrated gluon distributions involved in other different dijet channels in pA collisions are shown to be related to two widely proposed ones: the Weizs\"{a}cker-Williams gluon distribution and the dipole gluon distribution.

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