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We systematically study dijet production in various processes in the small-x limit and establish an effective kₓ-factorization for hard processes in a system with dilute probes scattering on a dense target. We find that the well-known Weizs\"acker-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-N₂ 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\"acker-Williams gluon distribution and the dipole gluon distribution.
Domínguez et al. (Wed,) studied this question.