Non-Gaussian elliptic-flow fluctuations in PbPb collisions at root S-NN=5.02 TeV

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Event-by-event fluctuations in the elliptic-flow coefficient v(2) are studied in PbPb collisions at root S-NN = 5.02 TeV using the CMS detector at the CERN LHC. Elliptic-flow probability distributions p(v(2)) for charged particles with transverse momentum 0.3 < p(T) < 3.0 GeV/c and pseudorapidity vertical bar eta vertical bar < 1.0 are determined for different collision centrality classes. The moments of the p(v(2)) distributions are used to calculate the v(2) coefficients based on cumulant orders 2, 4, 6, and 8. A rank ordering of the higher-order cumulant results and nonzero standardized skewness values obtained for the p(v(2)) distributions indicate non-Gaussian initial-state fluctuations. Bessel-Gaussian and elliptic power fits to the flow distributions are studied to characterize the initial-state spatial anisotropy. (C) 2018 The Author(s). Published by Elsevier B.V.
Original languageEnglish
JournalPhysics Letters B
Volume789
Pages (from-to)643-665
Number of pages23
ISSN0370-2693
DOIs
Publication statusPublished - 10 Feb 2019
MoE publication typeA1 Journal article-refereed

Fields of Science

  • 114 Physical sciences
  • Event-by-event elliptic flow
  • Non-Gaussian flow fluctuations
  • Unfolding
  • QUARK-GLUON PLASMA
  • PARTICLE-PRODUCTION
  • NUCLEAR COLLISIONS
  • PERSPECTIVE
  • ANISOTROPY
  • VISCOSITY

Cite this

@article{4d36eafa1f2b4de5931d82ce629beaa3,
title = "Non-Gaussian elliptic-flow fluctuations in PbPb collisions at root S-NN=5.02 TeV",
abstract = "Event-by-event fluctuations in the elliptic-flow coefficient v(2) are studied in PbPb collisions at root S-NN = 5.02 TeV using the CMS detector at the CERN LHC. Elliptic-flow probability distributions p(v(2)) for charged particles with transverse momentum 0.3 < p(T) < 3.0 GeV/c and pseudorapidity vertical bar eta vertical bar < 1.0 are determined for different collision centrality classes. The moments of the p(v(2)) distributions are used to calculate the v(2) coefficients based on cumulant orders 2, 4, 6, and 8. A rank ordering of the higher-order cumulant results and nonzero standardized skewness values obtained for the p(v(2)) distributions indicate non-Gaussian initial-state fluctuations. Bessel-Gaussian and elliptic power fits to the flow distributions are studied to characterize the initial-state spatial anisotropy. (C) 2018 The Author(s). Published by Elsevier B.V.",
keywords = "114 Physical sciences, Event-by-event elliptic flow, Non-Gaussian flow fluctuations, Unfolding, QUARK-GLUON PLASMA, PARTICLE-PRODUCTION, NUCLEAR COLLISIONS, PERSPECTIVE, ANISOTROPY, VISCOSITY",
author = "{The CMS Collaboration} and Sirunyan, {A. M.} and P. Eerola and H. Kirschenmann and J. Pekkanen and M. Voutilainen and J. Havukainen and Heikkil{\"a}, {J. K.} and T. J{\"a}rvinen and V. Karim{\"a}ki and R. Kinnunen and T. Lamp{\'e}n and K. Lassila-Perini and S. Laurila and S. Lehti and T. Lind{\'e}n and P. Luukka and H. Siikonen and E. Tuominen and J. Tuominiemi and T. Tuuva",
year = "2019",
month = "2",
day = "10",
doi = "10.1016/j.physletb.2018.11.063",
language = "English",
volume = "789",
pages = "643--665",
journal = "Physics Letters B",
issn = "0370-2693",
publisher = "Elsevier Scientific Publ. Co",

}

TY - JOUR

T1 - Non-Gaussian elliptic-flow fluctuations in PbPb collisions at root S-NN=5.02 TeV

AU - The CMS Collaboration

AU - Sirunyan, A. M.

AU - Eerola, P.

AU - Kirschenmann, H.

AU - Pekkanen, J.

AU - Voutilainen, M.

AU - Havukainen, J.

AU - Heikkilä, J. K.

AU - Järvinen, T.

AU - Karimäki, V.

AU - Kinnunen, R.

AU - Lampén, T.

AU - Lassila-Perini, K.

AU - Laurila, S.

AU - Lehti, S.

AU - Lindén, T.

AU - Luukka, P.

AU - Siikonen, H.

AU - Tuominen, E.

AU - Tuominiemi, J.

AU - Tuuva, T.

PY - 2019/2/10

Y1 - 2019/2/10

N2 - Event-by-event fluctuations in the elliptic-flow coefficient v(2) are studied in PbPb collisions at root S-NN = 5.02 TeV using the CMS detector at the CERN LHC. Elliptic-flow probability distributions p(v(2)) for charged particles with transverse momentum 0.3 < p(T) < 3.0 GeV/c and pseudorapidity vertical bar eta vertical bar < 1.0 are determined for different collision centrality classes. The moments of the p(v(2)) distributions are used to calculate the v(2) coefficients based on cumulant orders 2, 4, 6, and 8. A rank ordering of the higher-order cumulant results and nonzero standardized skewness values obtained for the p(v(2)) distributions indicate non-Gaussian initial-state fluctuations. Bessel-Gaussian and elliptic power fits to the flow distributions are studied to characterize the initial-state spatial anisotropy. (C) 2018 The Author(s). Published by Elsevier B.V.

AB - Event-by-event fluctuations in the elliptic-flow coefficient v(2) are studied in PbPb collisions at root S-NN = 5.02 TeV using the CMS detector at the CERN LHC. Elliptic-flow probability distributions p(v(2)) for charged particles with transverse momentum 0.3 < p(T) < 3.0 GeV/c and pseudorapidity vertical bar eta vertical bar < 1.0 are determined for different collision centrality classes. The moments of the p(v(2)) distributions are used to calculate the v(2) coefficients based on cumulant orders 2, 4, 6, and 8. A rank ordering of the higher-order cumulant results and nonzero standardized skewness values obtained for the p(v(2)) distributions indicate non-Gaussian initial-state fluctuations. Bessel-Gaussian and elliptic power fits to the flow distributions are studied to characterize the initial-state spatial anisotropy. (C) 2018 The Author(s). Published by Elsevier B.V.

KW - 114 Physical sciences

KW - Event-by-event elliptic flow

KW - Non-Gaussian flow fluctuations

KW - Unfolding

KW - QUARK-GLUON PLASMA

KW - PARTICLE-PRODUCTION

KW - NUCLEAR COLLISIONS

KW - PERSPECTIVE

KW - ANISOTROPY

KW - VISCOSITY

U2 - 10.1016/j.physletb.2018.11.063

DO - 10.1016/j.physletb.2018.11.063

M3 - Article

VL - 789

SP - 643

EP - 665

JO - Physics Letters B

JF - Physics Letters B

SN - 0370-2693

ER -