Non-perturbative computation of double inclusive gluon production in the Glasma

TL;DR

This paper performs a non-perturbative numerical analysis of double inclusive gluon production in the Glasma, supporting the idea that early-time flux tubes contribute to the ridge phenomena observed in heavy ion collisions.

Contribution

It introduces a non-perturbative numerical method to compute gluon correlations in the Glasma, revealing a semi-hard scale for flux tube correlations.

Findings

Supports the flux tube origin of the ridge

Identifies a semi-hard scale for color screening

Provides numerical evidence for early-time gluon correlations

Abstract

The near-side ridge observed in A+A collisions at RHIC has been described as arising from the radial flow of Glasma flux tubes formed at very early times in the collisions. We investigate the viability of this scenario by performing a non-perturbative numerical computation of double inclusive gluon production in the Glasma. Our results support the conjecture that the range of transverse color screening of correlations determining the size of the flux tubes is a semi-hard scale, albeit with non-trivial structure. We discuss our results in the context of ridge correlations in the RHIC heavy ion experiments.