Forward particle correlations in the color glass condensate

TL;DR

This paper advances the understanding of forward dihadron correlations in proton-nucleus collisions within the color glass condensate framework, emphasizing the role of higher point Wilson line correlators and double parton scattering.

Contribution

It introduces a Gaussian approximation for higher point Wilson line correlators and incorporates both elastic and inelastic contributions in dihadron correlation calculations.

Findings

Gaussian approximation effectively describes Wilson line correlators

The calculation includes double parton scattering effects

Results improve understanding of initial state effects in pA collisions

Abstract

Multiparticle correlations, such as forward dihadron correlations in pA collisions, are an important probe of the strong color fields that dominate the initial stages of a heavy ion collision. We describe recent progress in understanding two-particle correlations in the dilute-dense system, e.g. at forward rapidity in deuteron-gold collisions. This requires evaluating higher point Wilson line correlators from the JIMWLK equation, which we find well described by a Gaussian approximation. We then calculate the dihadron correlation, including both the "elastic" and "inelastic" contributions, and show that our result includes the double parton scattering contribution.