PoS - Proceedings of Science
Volume 340 - The 39th International Conference on High Energy Physics (ICHEP2018) - Parallel: Heavy Ions
Recent results on correlations and fluctuations in $p p$, $p$ +Pb, Pb+Pb and Xe+Xe collisions from the ATLAS Experiment at the LHC
M. Przybycien*  on behalf of the ATLAS Collaboration
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Published on: August 02, 2019
The azimuthal anisotropies of particle yields observed in relativistic heavy-ion collisions have been traditionally considered as a strong evidence of the formation of a de-confined quark-gluon plasma produced in these collisions. However multiple recent measurements from the LHC experiments in $pp$ and $p$+Pb systems show similar features as those observed in Pb+Pb collisions, indicating the possibility of the production of such a de-confined medium also in smaller collision systems.
This report presents a comprehensive summary of recent ATLAS measurements in $pp$ and $p$+Pb collisions as well as in Pb+Pb and Xe+Xe collisions. It includes measurements of two-particle hadron-hadron correlations in $\Delta\phi$ and $\Delta\eta$, with a template fitting procedure used to subtract the dijet contributions. Measurements of multi-particle cumulants using the standard cumulant method as well as a new sub-event cumulant method that suppresses the contribution of non-flow effects are discussed.
Studies of longitudinal flow decorrelation and correlations between flow harmonics and mean $p_\mathrm{T}$ of the event in Pb+Pb collisions are presented to provide deeper insight into details of the geometry of the initial state.
First results on flow harmonic measurements from Xe+Xe collisions are also discussed.
DOI: https://doi.org/10.22323/1.340.0445
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