Collective behavior in small systems
arXiv:1901.00710 · doi:10.1016/j.nuclphysa.2017.06.023
Abstract
The presence of correlations between particles significantly separated in pseudorapidity in proton-proton and proton-nucleus collisions has raised questions about whether collective effects are observed in small collision systems as well as in heavy-ion collisions. The quantification of these long-range correlations by coefficients is of particular interest. A selection of the latest measurements is presented, including results from the recent +Au beam energy scan at RHIC where a significant non-zero is measured down to low center-of-mass energies ( = 39 GeV). Results from a collision system scan - comprising +Au, +Au, and He+Au collisions - are also shown to address the role of the initial nuclear geometry in the final state anisotropy. Finally, the challenge of measuring multi-particle cumulants, particularly , in + collisions is discussed, and new methods for reducing the effects of non-flow are shown to produce a more robust measurement of in + collisions.
Proceedings of the XXVIth International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2017), February 2017
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