Consider the production of a hard dijet in high-energy DIS with large average transverse momentum \vec{P} = (\vec{k1}-\vec{k2})/2 and small(er) momentum imbalance \vec{q} = \vec{k1}+\vec{k2}. The cross section involves a sum of an isotropic contribution proportional to the conventional Weizsaecker-Williams gluon distribution and of a contribution proportional to cos(2phi) times the WW distribution of linearly polarized gluons. Here phi is the angle between \vec{P} and \vec{q}. These gluon distributions are given in terms of correlators of the gluon field in light-cone gauge. Numerical solutions of the LO JIMWLK evolution equations indicate a substantial "v2" given by the ratio of the two gluon distributions which approaches O(1) at q>Qs. The fluctuation of the azimuthal anisotropy at small x has also been analyzed.

Proton structure, small and large x physics