Signature of gluon saturation in forward di-hadron correlations at the Large Hadron Collider

TL;DR

This paper investigates gluon saturation effects at the LHC by analyzing two-particle correlations in p-Pb collisions, finding a strong centrality dependence at forward rapidity consistent with saturation predictions.

Contribution

It provides evidence for gluon saturation effects in LHC data by comparing experimental correlations with Color Glass Condensate theory predictions.

Findings

Stronger centrality dependence of away-side peak at forward rapidity

Agreement between LHCb data and saturation model calculations

Distinct difference in correlation patterns between midrapidity and forward rapidity

Abstract

We argue that gluon saturation effects may be visible in Large Hadron Collider (LHC) data. We look at the centrality dependence of the away-side peak of two-particle correlations measured in p-Pb collisions, using both ALICE data at midrapidity, and LHCb data at forward rapidity. Once the collective flow-like signal measured at the near-side peak is removed from the correlation function, the centrality dependence of the away-side peak turns out to be much stronger in the forward region than at midrapidity. We argue that this is a very specific prediction of the saturation framework, and we compare LHCb data to a state-of-the-art calculation within the Color Glass Condensate theory.