Collectivity in Small Collision Systems: An Initial-State Perspective

  title={Collectivity in Small Collision Systems: An Initial-State Perspective},
  author={S{\"o}ren Schlichting and Prithwish Tribedy},
  journal={Advances in High Energy Physics},
Measurements of multiparticle correlations in the collisions of small systems such as p+p, p/d/3He+A show striking similarity to the observations in heavy-ion collisions. A number of observables measured in the high-multiplicity events of these systems resemble features that are attributed to collectivity driven by hydrodynamics. However, alternative explanations based on initial-state dynamics are able to describe many characteristic features of these measurements. In this brief review, we… 

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