Charged-particle pseudorapidity density and anisotropic flow over a wide pseudorapidity range using ALICE at the LHC

TL;DR

This paper presents the first measurements of charged-particle pseudorapidity density and anisotropic flow over a wide pseudorapidity range at the LHC, providing insights into the longitudinal expansion in heavy-ion collisions.

Contribution

It extends measurements of pseudorapidity density and flow to very forward regions, analyzing longitudinal scaling and comparing with theoretical models.

Findings

First measurements over 8 units of pseudorapidity at the LHC.

Evidence of longitudinal scaling in heavy-ion collisions.

Comparison with models shows agreement/discrepancies in forward regions.

Abstract

The pseudorapidity density and anisotropic flow of charged-particles provide fundamental information about global variables and correlations in heavy-ion collisions. The pseudorapidity density is related to the energy available for particle production while the anisotropic flow is related to collective effects from interactions between these particles. Extending these measurements to very forward pseudorapidities yields information about the longitudinal expansion of the system. The first measurements performed at the LHC over more than 8 units of pseudorapidity are presented. The longitudinal scaling of the measurements is analyzed and comparison to models is performed.