On the linearly polarized gluon distributions in the color dipole model

Details On the linearly polarized gluon distributions in the color dipole model On the linearly polarized gluon distributions in the color dipole model

2011-09-28

arxiv.org/abs/1109.6293v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages,v2 with minor revision

Scientific paper

We show that the linearly polarized gluon distributions appear in the color dipole model as we derive the full cross sections of the DIS dijet production and the Drell-Yan dijet ($\gamma^*$ jet correlation) process. Together with the normal Weizs\"acker-Williams gluon distribution, the linearly polarized one will contribute to the DIS dijet production cross section as the coefficient of the $\cos(2 \Delta \phi) $ term in the correlation limit. We also derive the exact results for the cross section of the Drell-Yan dijet process, and find that the linearly polarized dipole gluon distribution which is identical to the normal dipole gluon distribution involves in the cross section. The results obtained in this paper agree with the previous transverse momentum dependent factorization study. We further derive the small-$x$ evolution of these linearly polarized gluon distributions and find that they rise as $x$ gets small at high energy.

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