Pseudorapidity correlations in heavy ion collisions from viscous fluid dynamics

TL;DR

This study uses 3+1D viscous fluid dynamics to analyze how two-particle pseudorapidity correlations in heavy ion collisions reveal information about initial state fluctuations and medium properties.

Contribution

It provides explicit calculations of pseudorapidity correlations in heavy ion collisions using viscous hydrodynamics with fluctuating initial conditions.

Findings

Legendre coefficients depend on initial fluctuations and medium viscosity.

Results constrain initial state models and quark-gluon plasma transport properties.

Correlations vary with collision energy and system size.

Abstract

We demonstrate by explicit calculations in 3+1 dimensional viscous relativistic fluid dynamics how two-particle pseudorapidity correlation functions in heavy ion collisions at the LHC and RHIC depend on the number of particle producing sources and the transport properties of the produced medium. In particular, we present results for the Legendre coefficients of the two-particle pseudorapidity correlation function in Pb+Pb collisions at 2760 GeV and Au+Au collisions at 200 GeV from viscous hydrodynamics with three dimensionally fluctuating initial conditions. Our results suggest that these coefficients provide important constraints on initial state fluctuations and the transport properties of the quark gluon plasma.