Correlations from hydrodynamic flow in p-Pb collisions

TL;DR

This paper investigates two-particle correlations in p-Pb collisions at the LHC using 3+1D viscous hydrodynamics, showing that collective flow explains ridge structures in high-multiplicity events.

Contribution

It demonstrates that hydrodynamic flow naturally accounts for ridge phenomena in p-Pb collisions, emphasizing the importance of collective effects in small systems.

Findings

Ridge structures emerge in high-multiplicity p-Pb events

Collective flow explains observed correlation patterns

Charge balancing and momentum conservation influence correlations

Abstract

Two-particle correlations in relative rapidity and azimuth are studied for the p-Pb collisions at the LHC energy of 5.02 TeV in the framework of event-by-event 3+1-dimensional viscous hydrodynamics. It is found that for the highest-multiplicity events the observed ridge structures appear in a natural way, suggesting that collective flow may be an important element in the evolution of the system. We also discuss the role of the charge balancing and the transverse-momentum conservation.