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Fluctuations of anisotropic flow in Pb+Pb collisions at s NN = 5. 02 TeV with the ATLAS detector

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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Fluctuations of anisotropic flow in Pb+Pb collisions at s NN = 5. 02 TeV with the ATLAS detector. / The ATLAS collaboration ; Long, Robin; Parker, Adam et al.
In: Journal of High Energy Physics, Vol. 2020, No. 1, 51, 09.01.2020.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

The ATLAS collaboration, Long, R, Parker, A, Tee, A, Walder, J & Whitmore, B 2020, 'Fluctuations of anisotropic flow in Pb+Pb collisions at s NN = 5. 02 TeV with the ATLAS detector', Journal of High Energy Physics, vol. 2020, no. 1, 51. https://doi.org/10.1007/jhep01(2020)051

APA

The ATLAS collaboration, Long, R., Parker, A., Tee, A., Walder, J., & Whitmore, B. (2020). Fluctuations of anisotropic flow in Pb+Pb collisions at s NN = 5. 02 TeV with the ATLAS detector. Journal of High Energy Physics, 2020(1), Article 51. https://doi.org/10.1007/jhep01(2020)051

Vancouver

The ATLAS collaboration, Long R, Parker A, Tee A, Walder J, Whitmore B. Fluctuations of anisotropic flow in Pb+Pb collisions at s NN = 5. 02 TeV with the ATLAS detector. Journal of High Energy Physics. 2020 Jan 9;2020(1):51. doi: 10.1007/jhep01(2020)051

Author

The ATLAS collaboration ; Long, Robin ; Parker, Adam et al. / Fluctuations of anisotropic flow in Pb+Pb collisions at s NN = 5. 02 TeV with the ATLAS detector. In: Journal of High Energy Physics. 2020 ; Vol. 2020, No. 1.

Bibtex

@article{59448d18cc2e4664addb4ac1e530c990,
title = "Fluctuations of anisotropic flow in Pb+Pb collisions at s NN = 5. 02 TeV with the ATLAS detector",
abstract = "Multi-particle azimuthal cumulants are measured as a function of centrality and transverse momentum using 470 {\^I}¼b{\^a}ˆ{\textquoteright}1 of Pb+Pb collisions at sNN = 5.02 TeV with the ATLAS detector at the LHC. These cumulants provide information on the event-by-event fluctuations of harmonic flow coefficients vn and correlated fluctuations between two harmonics vn and vm. For the first time, a non-zero four-particle cumulant is observed for dipolar flow, v1. The four-particle cumulants for elliptic flow, v2, and triangular flow, v3, exhibit a strong centrality dependence and change sign in ultra-central collisions. This sign change is consistent with significant non-Gaussian fluctuations in v2 and v3. The four-particle cumulant for quadrangular flow, v4, is found to change sign in mid-central collisions. Correlations between two harmonics are studied with three- and four-particle mixed-harmonic cumulants, which indicate an anti-correlation between v2 and v3, and a positive correlation between v2 and v4. These correlations decrease in strength towards central collisions and either approach zero or change sign in ultra-central collisions. To investigate the possible flow fluctuations arising from intrinsic centrality or volume fluctuations, the results are compared between two different event classes used for centrality definitions. In peripheral and mid-central collisions where the cumulant signals are large, only small differences are observed. In ultra-central collisions, the differences are much larger and transverse momentum dependent. These results provide new information to disentangle flow fluctuations from the initial and final states, as well as new insights on the influence of centrality fluctuations.",
keywords = "Collective flow, Particle correlations and fluctuations, Event-by-event fluctuation, Hadron-Hadron scattering (experiments), Heavy-ion collision",
author = "{The ATLAS collaboration} and A.E. Barton and I.A. Bertram and G. Borissov and E.V. Bouhova-Thacker and H. Fox and R.C.W. Henderson and R.W.L. Jones and V. Kartvelishvili and Robin Long and P.A. Love and D. Muenstermann and Adam Parker and M. Smizanska and Amy Tee and James Walder and A.M. Wharton and Ben Whitmore",
year = "2020",
month = jan,
day = "9",
doi = "10.1007/jhep01(2020)051",
language = "English",
volume = "2020",
journal = "Journal of High Energy Physics",
issn = "1029-8479",
publisher = "Springer-Verlag",
number = "1",

}

RIS

TY - JOUR

T1 - Fluctuations of anisotropic flow in Pb+Pb collisions at s NN = 5. 02 TeV with the ATLAS detector

AU - The ATLAS collaboration

AU - Barton, A.E.

AU - Bertram, I.A.

AU - Borissov, G.

AU - Bouhova-Thacker, E.V.

AU - Fox, H.

AU - Henderson, R.C.W.

AU - Jones, R.W.L.

AU - Kartvelishvili, V.

AU - Long, Robin

AU - Love, P.A.

AU - Muenstermann, D.

AU - Parker, Adam

AU - Smizanska, M.

AU - Tee, Amy

AU - Walder, James

AU - Wharton, A.M.

AU - Whitmore, Ben

PY - 2020/1/9

Y1 - 2020/1/9

N2 - Multi-particle azimuthal cumulants are measured as a function of centrality and transverse momentum using 470 μb−1 of Pb+Pb collisions at sNN = 5.02 TeV with the ATLAS detector at the LHC. These cumulants provide information on the event-by-event fluctuations of harmonic flow coefficients vn and correlated fluctuations between two harmonics vn and vm. For the first time, a non-zero four-particle cumulant is observed for dipolar flow, v1. The four-particle cumulants for elliptic flow, v2, and triangular flow, v3, exhibit a strong centrality dependence and change sign in ultra-central collisions. This sign change is consistent with significant non-Gaussian fluctuations in v2 and v3. The four-particle cumulant for quadrangular flow, v4, is found to change sign in mid-central collisions. Correlations between two harmonics are studied with three- and four-particle mixed-harmonic cumulants, which indicate an anti-correlation between v2 and v3, and a positive correlation between v2 and v4. These correlations decrease in strength towards central collisions and either approach zero or change sign in ultra-central collisions. To investigate the possible flow fluctuations arising from intrinsic centrality or volume fluctuations, the results are compared between two different event classes used for centrality definitions. In peripheral and mid-central collisions where the cumulant signals are large, only small differences are observed. In ultra-central collisions, the differences are much larger and transverse momentum dependent. These results provide new information to disentangle flow fluctuations from the initial and final states, as well as new insights on the influence of centrality fluctuations.

AB - Multi-particle azimuthal cumulants are measured as a function of centrality and transverse momentum using 470 μb−1 of Pb+Pb collisions at sNN = 5.02 TeV with the ATLAS detector at the LHC. These cumulants provide information on the event-by-event fluctuations of harmonic flow coefficients vn and correlated fluctuations between two harmonics vn and vm. For the first time, a non-zero four-particle cumulant is observed for dipolar flow, v1. The four-particle cumulants for elliptic flow, v2, and triangular flow, v3, exhibit a strong centrality dependence and change sign in ultra-central collisions. This sign change is consistent with significant non-Gaussian fluctuations in v2 and v3. The four-particle cumulant for quadrangular flow, v4, is found to change sign in mid-central collisions. Correlations between two harmonics are studied with three- and four-particle mixed-harmonic cumulants, which indicate an anti-correlation between v2 and v3, and a positive correlation between v2 and v4. These correlations decrease in strength towards central collisions and either approach zero or change sign in ultra-central collisions. To investigate the possible flow fluctuations arising from intrinsic centrality or volume fluctuations, the results are compared between two different event classes used for centrality definitions. In peripheral and mid-central collisions where the cumulant signals are large, only small differences are observed. In ultra-central collisions, the differences are much larger and transverse momentum dependent. These results provide new information to disentangle flow fluctuations from the initial and final states, as well as new insights on the influence of centrality fluctuations.

KW - Collective flow

KW - Particle correlations and fluctuations

KW - Event-by-event fluctuation

KW - Hadron-Hadron scattering (experiments)

KW - Heavy-ion collision

U2 - 10.1007/jhep01(2020)051

DO - 10.1007/jhep01(2020)051

M3 - Journal article

VL - 2020

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

IS - 1

M1 - 51

ER -