Long-range angular correlations at the LHC with ALICE

TL;DR

This paper investigates long-range angular correlations in high-multiplicity p-Pb collisions at the LHC, comparing them to Pb-Pb collisions, and explores their origins through two-particle correlation analysis and identified particle studies.

Contribution

It extends the analysis of long-range correlations to identified particles and compares the mass dependence to hydrodynamic expectations, providing insights into the underlying mechanisms.

Findings

Mass dependence in p-Pb resembles Pb-Pb patterns

Long-range structures are compatible with hydrodynamics

Subtraction of long-range correlations isolates jet fragmentation

Abstract

The observation of long-range correlations on the near and away side -the double ridge- in high-multiplicity p-Pb collisions at sqrt(s_NN) = 5.02 TeV and its similarity to Pb-Pb collisions remains one of the open questions from the p-Pb run at the Large Hadron Collider (LHC). It has been attributed to mechanisms that involve initial-state effects, such as gluon saturation and colour connections forming along the longitudinal direction, and final-state effects, such as parton-induced interactions and collective effects developing in a high-density system possibly formed in these collisions. In order to understand the nature of this double- ridge structure the two-particle correlation analysis has been extended to identified particles. The observed mass dependence in p-Pb resembles the pattern observed in Pb-Pb collisions and is compatible with expectations from hydrodynamics. The subtraction of the long-range structures allows the study of the hadron production belonging to the fragmentation of jets originating from low momentum-transfer scatterings (minijets).