Large-rapidity ridge correlations from Color Glass Condensate

TL;DR

This paper refines the CGC effective field theory to better explain large-rapidity ridge correlations in high-energy collisions, aligning theoretical predictions with experimental data by accounting for boost invariance violations and gluon saturation effects.

Contribution

It introduces a corrected normalization scheme for rapidity correlations in CGC, explaining the observed rebound in ridge correlations at large rapidities.

Findings

Correlation rebound occurs around the sum of saturation momenta.

Rebound shifts to larger rapidities at higher energies.

Results align with CMS experimental data.

Abstract

Within the Color Glass Condensate (CGC) effective field theory, considering the violation of boost invariance of the rapidity distribution, we correct the normalization scheme of the longitudinal rapidity ridge correlations. After this correction, the large-rapidity ridge correlation rebounds after bottoming, consistent with the observed data from the CMS detector. It is also found that the correlation rebound appears around the sum of the saturation momentum of the projectile and target, and moves to larger rapidities at higher collision energies. These features directly result from the saturation and the quantum evolution of gluons within the framework of the CGC.