Longitudinal correlations in the initial stages of ultra-relativistic nuclear collisions

TL;DR

This paper reviews how longitudinal correlations, including the torque effect and two-particle correlations, are modeled in ultra-relativistic nuclear collisions using event-by-event fluctuations and hydrodynamics, aligning with recent experimental data.

Contribution

It introduces a comprehensive model combining initial condition fluctuations, 3D viscous hydrodynamics, and statistical hadronization to study longitudinal correlations in nuclear collisions.

Findings

Model reproduces the torque effect observed experimentally.

Two-particle pseudorapidity correlations are explained by initial fluctuations.

Results support the importance of event-by-event fluctuations in collision dynamics.

Abstract

In this talk we review some of our results for the longitudinal correlations in connection with recent experimental data, in particular for the {\em torque} effect and for the two-particle correlations in pseudorapidity, $C(\eta_1,\eta_2)$. The model framework involves event-by-event fluctuations of the initial conditions, followed with 3D viscous hydrodynamic evolution and statistical hadronization.