Long range rapidity correlations and the ridge in A+A collisions

TL;DR

This paper explores the origin of long-range rapidity correlations and the ridge phenomenon in heavy ion collisions, linking early-time strong color field dynamics to observable correlation patterns.

Contribution

It introduces a formalism for n-gluon correlations in the Glasma flux tube model, incorporating all orders in perturbation theory at leading logarithmic accuracy, including bremsstrahlung and screening effects.

Findings

Long-range correlations serve as a chronometer for early color field dynamics.

The formalism captures key features of the ridge phenomenon in heavy ion collisions.

Results connect initial state effects to observed collective behavior.

Abstract

We discuss results for n-gluon correlations that form the basis of the Glasma flux tube picture of early times in heavy ion collisions. Our formalism is valid to all orders in perturbation theory at leading logarithmic accuracy in x and includes both QCD bremsstrahlung and the many body screening and recombination effects that are important at large parton densities. Long range rapidity correlations, as seen in the near-side ridge in heavy ion collisions, are a chronometer of these early time strong color field dynamics. They also contain information on how radial flow develops in heavy ion collisions.