Two-gluon correlations and initial conditions for small-x evolution

Abstract

We derive the effective action of the hard large-x valence charges up to fourth order in their density. Such non-Gaussian weight functionals contribute at leading order in N_c to the connected two-gluon production diagrams which determine di-hadron correlations. The corresponding diagrams are not necessarily (highly) suppressed by the density of valence charges since their infrared divergences differ from those obtained in a Gaussian theory. Therefore, it appears prudent to include such higher dimensional operators when determining initial ensembles for JIMWLK evolution of higher n-point functions of Wilson lines.

12 pages; v2: fixed layout

References in corpus (5)

• Dihadron azimuthal correlations in Au+Au collisions at sqrt(s_NN)=200 GeV
• The ridge in proton-proton collisions at the LHC
• Angular Correlations in Gluon Production at High Energy
• Intra-jet correlations of high-$p_t$ hadrons from STAR
• Correlation of small-x gluons in impact parameter space