Charged particle directed flow in Pb-Pb collisions at sqrt{s_NN} = 2.76 TeV measured with ALICE at the LHC

TL;DR

This paper reports measurements of charged particle directed flow in Pb-Pb collisions at 2.76 TeV at the LHC, analyzing its dependence on centrality, transverse momentum, and pseudorapidity, and comparing results with RHIC data and theoretical models.

Contribution

It provides the first detailed measurement of directed flow at LHC energies across different rapidities and compares these findings with existing models and lower-energy data.

Findings

Directed flow varies with collision centrality and pseudorapidity.

Results show differences between LHC and RHIC measurements.

Model comparisons highlight the need for refined theoretical descriptions.

Abstract

Charged particle directed flow at midrapidity, |eta|<0.8, and forward rapidity, 1.7 < |eta|<5.1, is measured in Pb-Pb collisions at sqrt{s_NN} = 2.76 TeV with ALICE at the LHC. Directed flow is reported as a function of collision centrality, charged particle transverse momentum, and pseudo-rapidity. Results are compared to measurements at RHIC and recent model calculations for LHC energies.