TL;DR
This paper reviews recent progress in understanding how collective phenomena develop in small and large colliding systems, focusing on thermalization, hydrodynamization, and flow, using kinetic theory insights.
Contribution
It connects studies of thermalization and hydrodynamization in large systems with flow phenomena in small systems through kinetic theory analysis.
Findings
Hydrodynamization is closely linked to flow development in small systems.
Recent progress in bottom-up thermalization explains large system behavior.
Connections to hard probes are discussed.
Abstract
Deciphering the origin of collective phenomena in small colliding systems is one of contemporary focuses in heavy-ion physics. It entails penetrating the barrier between two previously separated research topics: thermalization/hydrodynamization and phenomenological studies of collectivity. I first review some recent progress in understanding thermalization/hydrodynamization in large colliding systems, centralized on bottom-up thermalization. Then, using a simple kinetic theory I demonstrate how the investigation of hydrodynamization is intertwined with the study of flow in small colliding systems. Connections of these studies to "hard probes" are also commented where possible.
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Taxonomy
TopicsHigh-Energy Particle Collisions Research · Quantum Chromodynamics and Particle Interactions · Particle physics theoretical and experimental studies