Novel Collective Phenomena in High-Energy Proton-Proton and Proton-Nucleus Collisions

TL;DR

This paper reviews experimental and theoretical advances in understanding collective phenomena in high-energy proton-proton and proton-nucleus collisions, highlighting new insights into high-density QCD effects in small systems.

Contribution

It provides a comprehensive overview of recent experimental results and theoretical interpretations of collective phenomena in small collision systems from RHIC and LHC.

Findings

Observation of long-range correlations in small systems

Comparison of experimental data with various theoretical models

Discussion of future research directions in QCD phenomena

Abstract

The observation of long-range collective correlations for particles emitted in high-multiplicity pp and pPb collisions has opened up new opportunities of investigating novel high-density QCD phenomena in small colliding systems. We review experimental results related to the studies of collective phenomena in small systems from RHIC and the LHC over the past several years. Latest development in theoretical interpretations motivated by different frameworks are also reviewed, and confronted with the experimental data. Perspectives on possible future directions are discussed, with the aim of further exploring the rich emergent QCD phenomena.