Correlated long-range mixed-harmonic fluctuations measured in <i>pp</i>, <i>p</i> plus Pb and low-multiplicity Pb plus Pb collisions with the ATLAS detector



Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2903 more authors) (2019) Correlated long-range mixed-harmonic fluctuations measured in <i>pp</i>, <i>p</i> plus Pb and low-multiplicity Pb plus Pb collisions with the ATLAS detector. PHYSICS LETTERS B, 789. pp. 444-471.

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Abstract

Correlations of two flow harmonics $v_n$ and $v_m$ via three- and four-particle cumulants are measured in 13 TeV $pp$, 5.02 TeV $p$+Pb, and 2.76 TeV peripheral Pb+Pb collisions with the ATLAS detector at the LHC. The goal is to understand the multi-particle nature of the long-range collective phenomenon in these collision systems. The large non-flow background from dijet production present in the standard cumulant method is suppressed using a method of subevent cumulants involving two, three and four subevents separated in pseudorapidity. The results show a negative correlation between $v_2$ and $v_3$ and a positive correlation between $v_2$ and $v_4$ for all collision systems and over the full multiplicity range. However, the magnitudes of the correlations are found to depend strongly on the event multiplicity, the choice of transverse momentum range and collision system. The relative correlation strength, obtained by normalisation of the cumulants with the $\langle v_n^2\rangle$ from a two-particle correlation analysis, is similar in the three collision systems and depends weakly on the event multiplicity and transverse momentum. These results based on the subevent methods provide strong evidence of a similar long-range multi-particle collectivity in $pp$, $p$+Pb and peripheral Pb+Pb collisions.

Item Type: Article
Additional Information: 44 pages in total, author list starting page 28, 10 figures, 1 table, published in Phys. Lett. B. All figures including auxiliary figures can be found at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2017-07/
Uncontrolled Keywords: nucl-ex, nucl-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 10 Sep 2018 15:36
Last Modified: 18 Oct 2023 14:00
DOI: 10.1016/j.physletb.2018.11.065
Open Access URL: https://doi.org/10.1016/j.physletb.2018.11.065
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3026067