Measurement of event-plane correlations in root s(NN)=2.76 TeV lead-lead collisions with the ATLAS detector

ATLAS Collaboration

Research output: Contribution to journalArticle

111 Citations (Scopus)

Abstract

A measurement of event-plane correlations involving two or three event planes of different order is presented as a function of centrality for 7 mu b(-1) Pb + Pb collision data at v root s(NN) = 2.76 TeV, recorded by the ATLAS experiment at the Large Hadron Collider. Fourteen correlators are measured using a standard event-plane method and a scalar-product method, and the latter method is found to give a systematically larger correlation signal. Several different trends in the centrality dependence of these correlators are observed. These trends are not reproduced by predictions based on the Glauber model, which includes only the correlations from the collision geometry in the initial state. Calculations that include the final-state collective dynamics are able to describe qualitatively, and in some cases also quantitatively, the centrality dependence of the measured correlators. These observations suggest that both the fluctuations in the initial geometry and the nonlinear mixing between different harmonics in the final state are important for creating these correlations in momentum space.
Original languageEnglish
Article number024905
JournalPhysical Review C
Volume90
Issue number2
DOIs
Publication statusPublished - 12 Aug 2014

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correlators
collisions
detectors
trends
geometry
scalars
momentum
harmonics
products
predictions

Keywords

  • HEAVY-ION COLLISIONS
  • INITIAL GEOMETRY FLUCTUATIONS
  • NUCLEAR COLLISIONS
  • PB COLLISIONS
  • FLOW

Cite this

@article{ff868ddc148e45799480f6a9f3f3ba05,
title = "Measurement of event-plane correlations in root s(NN)=2.76 TeV lead-lead collisions with the ATLAS detector",
abstract = "A measurement of event-plane correlations involving two or three event planes of different order is presented as a function of centrality for 7 mu b(-1) Pb + Pb collision data at v root s(NN) = 2.76 TeV, recorded by the ATLAS experiment at the Large Hadron Collider. Fourteen correlators are measured using a standard event-plane method and a scalar-product method, and the latter method is found to give a systematically larger correlation signal. Several different trends in the centrality dependence of these correlators are observed. These trends are not reproduced by predictions based on the Glauber model, which includes only the correlations from the collision geometry in the initial state. Calculations that include the final-state collective dynamics are able to describe qualitatively, and in some cases also quantitatively, the centrality dependence of the measured correlators. These observations suggest that both the fluctuations in the initial geometry and the nonlinear mixing between different harmonics in the final state are important for creating these correlations in momentum space.",
keywords = "HEAVY-ION COLLISIONS , INITIAL GEOMETRY FLUCTUATIONS , NUCLEAR COLLISIONS , PB COLLISIONS , FLOW",
author = "AD Wemans and {ATLAS Collaboration}",
year = "2014",
month = "8",
day = "12",
doi = "10.1103/PhysRevC.90.024905",
language = "English",
volume = "90",
journal = "Physical Review C",
issn = "0556-2813",
publisher = "The American Physical Society",
number = "2",

}

Measurement of event-plane correlations in root s(NN)=2.76 TeV lead-lead collisions with the ATLAS detector. / ATLAS Collaboration.

In: Physical Review C, Vol. 90, No. 2, 024905, 12.08.2014.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Measurement of event-plane correlations in root s(NN)=2.76 TeV lead-lead collisions with the ATLAS detector

AU - Wemans, AD

AU - ATLAS Collaboration

PY - 2014/8/12

Y1 - 2014/8/12

N2 - A measurement of event-plane correlations involving two or three event planes of different order is presented as a function of centrality for 7 mu b(-1) Pb + Pb collision data at v root s(NN) = 2.76 TeV, recorded by the ATLAS experiment at the Large Hadron Collider. Fourteen correlators are measured using a standard event-plane method and a scalar-product method, and the latter method is found to give a systematically larger correlation signal. Several different trends in the centrality dependence of these correlators are observed. These trends are not reproduced by predictions based on the Glauber model, which includes only the correlations from the collision geometry in the initial state. Calculations that include the final-state collective dynamics are able to describe qualitatively, and in some cases also quantitatively, the centrality dependence of the measured correlators. These observations suggest that both the fluctuations in the initial geometry and the nonlinear mixing between different harmonics in the final state are important for creating these correlations in momentum space.

AB - A measurement of event-plane correlations involving two or three event planes of different order is presented as a function of centrality for 7 mu b(-1) Pb + Pb collision data at v root s(NN) = 2.76 TeV, recorded by the ATLAS experiment at the Large Hadron Collider. Fourteen correlators are measured using a standard event-plane method and a scalar-product method, and the latter method is found to give a systematically larger correlation signal. Several different trends in the centrality dependence of these correlators are observed. These trends are not reproduced by predictions based on the Glauber model, which includes only the correlations from the collision geometry in the initial state. Calculations that include the final-state collective dynamics are able to describe qualitatively, and in some cases also quantitatively, the centrality dependence of the measured correlators. These observations suggest that both the fluctuations in the initial geometry and the nonlinear mixing between different harmonics in the final state are important for creating these correlations in momentum space.

KW - HEAVY-ION COLLISIONS

KW - INITIAL GEOMETRY FLUCTUATIONS

KW - NUCLEAR COLLISIONS

KW - PB COLLISIONS

KW - FLOW

U2 - 10.1103/PhysRevC.90.024905

DO - 10.1103/PhysRevC.90.024905

M3 - Article

VL - 90

JO - Physical Review C

JF - Physical Review C

SN - 0556-2813

IS - 2

M1 - 024905

ER -