Tracing the emergence of collectivity phenomena in small systems

TL;DR

This paper investigates initial state momentum correlations and geometry in small p+Pb collision systems at high energy, revealing large rapidity correlations in geometry but short-range momentum correlations, impacting understanding of collectivity.

Contribution

It extends the IP-Glasma model to 3D with JIMWLK evolution, providing new insights into rapidity dependence of initial state effects in small systems.

Findings

Geometry correlates over large rapidity intervals.

Momentum correlations have short rapidity range.

Implications for the origin of collectivity in small systems.

Abstract

We study initial state momentum correlations and event-by-event geometry in p+Pb collisions at $\sqrt{s}=5.02~\rm TeV$ by following the approach of extending the IP-Glasma model to 3D using JIMWLK rapidity evolution. On examining the non-trivial rapidity dependence of the observables, we find that the geometry is correlated over large rapidity intervals, while the initial state momentum correlations have a relatively short range in rapidity. Based on our results, we discuss implications for the relevance of both effects in explaining the origin of collective phenomena in small systems.