TL;DR
This paper explores multigluon correlations in high energy collisions using the JIMWLK equation, revealing limitations of the large Nc approximation and proposing a Gaussian finite Nc approach that aligns well with full results, with implications for understanding the ridge phenomenon.
Contribution
It introduces a Gaussian finite Nc approximation for multigluon correlations within the JIMWLK framework, improving accuracy over the large Nc approximation.
Findings
Large Nc approximation is not very accurate
Gaussian finite Nc approximation closely matches full results
Insights into correlations at large rapidity separations
Abstract
We discuss applications of the JIMWLK renormalization group equation to multigluon correlations in high energy collisions. This includes recent progress in computing the energy dependence of higher point Wilson line correlators from the JIMWLK renormalization group equation. We find that the large Nc approximation used so far in the phenomenological literature is not very accurate. On the other hand a Gaussian finite Nc approximation is surprisingly close to the full result. We also discuss correlations at large rapidity separations, relevant for the "ridge" correlations observed in experiments.
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