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Measurement of longitudinal flow decorrelations in Pb+Pb collisions at √sNN=2.76 and 5.02 TeV with the ATLAS detector

Aaboud, M; Aad, G; Abbott, B.; Abdinov, O; Abeloos, B; Abidi, S. H.; Åkesson, Torsten LU ; Bocchetta, Simona LU ; Doglioni, Caterina LU and Hedberg, Vincent LU , et al. (2018) In European Physical Journal C 78(2).
Abstract
Measurements of longitudinal flow correlations are presented for charged particles in the pseudorapidity range | η| < 2.4 using 7 and 470 μ b - 1 of Pb+Pb collisions at sNN=2.76 and 5.02 TeV, respectively, recorded by the ATLAS detector at the LHC. It is found that the correlation between the harmonic flow coefficients vn measured in two separated η intervals does not factorise into the product of single-particle coefficients, and this breaking of factorisation, or flow decorrelation, increases linearly with the η separation between the intervals. The flow decorrelation is stronger at 2.76 TeV than at 5.02 TeV. Higher-order moments of the correlations are also measured, and the corresponding linear coefficients for the kth -moment of... (More)
Measurements of longitudinal flow correlations are presented for charged particles in the pseudorapidity range | η| < 2.4 using 7 and 470 μ b - 1 of Pb+Pb collisions at sNN=2.76 and 5.02 TeV, respectively, recorded by the ATLAS detector at the LHC. It is found that the correlation between the harmonic flow coefficients vn measured in two separated η intervals does not factorise into the product of single-particle coefficients, and this breaking of factorisation, or flow decorrelation, increases linearly with the η separation between the intervals. The flow decorrelation is stronger at 2.76 TeV than at 5.02 TeV. Higher-order moments of the correlations are also measured, and the corresponding linear coefficients for the kth -moment of the vn are found to be proportional to k for v3, but not for v2. The decorrelation effect is separated into contributions from the magnitude of vn and the event-plane orientation, each as a function of η. These two contributions are found to be comparable. The longitudinal flow correlations are also measured between vn of different order in n. The decorrelations of v2 and v3 are found to be independent of each other, while the decorrelations of v4 and v5 are found to be driven by the nonlinear contribution from v22 and v2v3, respectively. © 2018, CERN for the benefit of the ATLAS collaboration. (Less)
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European Physical Journal C
volume
78
issue
2
publisher
Springer
external identifiers
  • scopus:85042405179
ISSN
1434-6044
DOI
10.1140/epjc/s10052-018-5605-7
language
English
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yes
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e80155d2-013f-46e3-8e3f-6ea5fc734bf8
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2018-03-08 15:17:37
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2018-11-21 21:38:33
@article{e80155d2-013f-46e3-8e3f-6ea5fc734bf8,
  abstract     = {Measurements of longitudinal flow correlations are presented for charged particles in the pseudorapidity range | η| &lt; 2.4 using 7 and 470 μ b - 1 of Pb+Pb collisions at sNN=2.76 and 5.02 TeV, respectively, recorded by the ATLAS detector at the LHC. It is found that the correlation between the harmonic flow coefficients vn measured in two separated η intervals does not factorise into the product of single-particle coefficients, and this breaking of factorisation, or flow decorrelation, increases linearly with the η separation between the intervals. The flow decorrelation is stronger at 2.76 TeV than at 5.02 TeV. Higher-order moments of the correlations are also measured, and the corresponding linear coefficients for the kth -moment of the vn are found to be proportional to k for v3, but not for v2. The decorrelation effect is separated into contributions from the magnitude of vn and the event-plane orientation, each as a function of η. These two contributions are found to be comparable. The longitudinal flow correlations are also measured between vn of different order in n. The decorrelations of v2 and v3 are found to be independent of each other, while the decorrelations of v4 and v5 are found to be driven by the nonlinear contribution from v22 and v2v3, respectively. © 2018, CERN for the benefit of the ATLAS collaboration.},
  articleno    = {142},
  author       = {Aaboud, M and Aad, G and Abbott, B. and Abdinov, O and Abeloos, B and Abidi, S. H. and Åkesson, Torsten and Bocchetta, Simona and Doglioni, Caterina and Hedberg, Vincent and Jarlskog, Göran and Kalderon, Charles and Kellermann, Edgar and Konya, Balazs and Lytken, Else and Mankinen, Katja and Mjörnmark, Ulf and Pöttgen, Ruth and Poulsen, Trine and Smirnova, Oxana and Viazlo, Oleksandr and , },
  issn         = {1434-6044},
  language     = {eng},
  number       = {2},
  publisher    = {Springer},
  series       = {European Physical Journal C},
  title        = {Measurement of longitudinal flow decorrelations in Pb+Pb collisions at √sNN=2.76 and 5.02 TeV with the ATLAS detector},
  url          = {http://dx.doi.org/10.1140/epjc/s10052-018-5605-7},
  volume       = {78},
  year         = {2018},
}