Systematic study of flow vector fluctuations in $\sqrt{{\text{s}}_{{}_{\mathbf{NN}}}}=5.02$ TeV Pb-Pb collisions

Abstract

Measurements of the $p_{\mathrm{T}}$-dependent flow vector fluctuations in Pb-Pb collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}=5.02\mathrm{TeV}$ using azimuthal correlations with the ALICE experiment at the Large Hadron Collider are presented. A four-particle correlation approach [1] is used to quantify the effects of flow angle and magnitude fluctuations separately. This paper extends previous studies to additional centrality intervals and provides measurements of the $p_{\mathrm{T}}$-dependent flow vector fluctuations at $\sqrt{s_{{}_{\mathrm{NN}}}}=5.02\mathrm{TeV}$ with two-particle correlations. Significant $p_{\mathrm{T}}$-dependent fluctuations of the ${\vec{V}}_2$ flow vector in Pb-Pb collisions are found across different centrality ranges, with the largest fluctuations of up to $\sim$15% being present in the 5% most central collisions. In parallel, no evidence of significant $p_{\mathrm{T}}$-dependent fluctuations of ${\vec{V}}_3$ or ${\vec{V}}_4$ is found. Additionally, evidence of flow angle and magnitude fluctuations is observed with more than $5\sigma$ significance in central collisions. These observations in Pb-Pb collisions indicate where the classical picture of hydrodynamic modeling with a common symmetry plane breaks down. This has implications for hard probes at high $p_{\mathrm{T}}$, which might be biased by $p_{\mathrm{T}}$-dependent flow angle fluctuations of at least 23% in central collisions. Given the presented results, existing theoretical models should be re-examined to improve our understanding of initial conditions, quark--gluon plasma properties, and the dynamic evolution of the created system.

29 pages, 9 captioned figures, 1 table, authors from page 23, published version, figures at http://alice-publications.web.cern.ch/node/10850

References in corpus (61)

• Experimental and Theoretical Challenges in the Search for the Quark Gluon Plasma: The STAR Collaboration's Critical Assessment of the Evidence from RHIC Collisions
• Formation of dense partonic matter in relativistic nucleus-nucleus collisions at RHIC: Experimental evaluation by the PHENIX collaboration
• Quark Gluon Plasma an Color Glass Condensate at RHIC? The perspective from the BRAHMS experiment
• The PHOBOS Perspective on Discoveries at RHIC
• A Multi-Phase Transport Model for Relativistic Heavy Ion Collisions
• Collective flow and viscosity in relativistic heavy-ion collisions
• Performance of the ALICE Experiment at the CERN LHC
• Observation of Long-Range Near-Side Angular Correlations in Proton-Proton Collisions at the LHC
• Elliptic flow of charged particles in Pb-Pb collisions at 2.76 TeV
• Long-range angular correlations on the near and away side in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Hydrodynamic Modeling of Heavy-Ion Collisions
• The ALICE TPC, a large 3-dimensional tracking device with fast readout for ultra-high multiplicity events
• Elliptic Flow of Identified Hadrons in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Higher harmonic anisotropic flow measurements of charged particles in Pb-Pb collisions at 2.76 TeV
• Event-by-event anisotropic flow in heavy-ion collisions from combined Yang-Mills and viscous fluid dynamics
• Particle-type dependence of azimuthal anisotropy and nuclear modification of particle production in Au+Au collisions at s(NN)**(1/2) = 200-GeV
• Measurement of the azimuthal anisotropy for charged particle production in sqrt(s_NN) = 2.76 TeV lead-lead collisions with the ATLAS detector
• Alternative ansatz to wounded nucleon and binary collision scaling in high-energy nuclear collisions
• Triangularity and Dipole Asymmetry in Heavy Ion Collisions
• Centrality determination of Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV with ALICE
• Flow analysis from multiparticle azimuthal correlations
• Performance of the ALICE VZERO system
• Alignment of the ALICE Inner Tracking System with cosmic-ray tracks
• Triangular flow in hydrodynamics and transport theory
• System Size, Energy, Pseudorapidity, and Centrality Dependence of Elliptic Flow
• Measurement of the pseudorapidity and transverse momentum dependence of the elliptic flow of charged particles in lead-lead collisions at sqrt(s_NN) = 2.76 TeV with the ATLAS detector
• Multi-system Bayesian constraints on the transport coefficients of QCD matter
• Event-by-event distributions of azimuthal asymmetries in ultrarelativistic heavy-ion collisions
• Centrality dependence of dihadron correlations and azimuthal anisotropy harmonics in PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• Measurement of the elliptic anisotropy of charged particles produced in PbPb collisions at nucleon-nucleon center-of-mass energy = 2.76 TeV
• Generic framework for anisotropic flow analyses with multi-particle azimuthal correlations
• Harmonic decomposition of two-particle angular correlations in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Measurement of the distributions of event-by-event flow harmonics in lead--lead collisions at sqrt(s_NN)=2.76 TeV with the ATLAS detector at the LHC
• Azimuthal anisotropy at RHIC: the first and fourth harmonics
• Bayesian analysis of heavy ion collisions with the heavy ion computational framework Trajectum
• Anisotropic flow of charged particles in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Evidence for transverse momentum and pseudorapidity dependent event plane fluctuations in PbPb and pPb collisions
• Elliptic flow in the Gaussian model of eccentricity fluctuations
• Elliptic flow of identified hadrons in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Long-range and short-range dihadron angular correlations in central PbPb collisions at a nucleon-nucleon center of mass energy of 2.76 TeV
• Azimuthal anisotropy of charged particles at high transverse momenta in PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• Hydrodynamic event-plane correlations in Pb+Pb collisions at sqrt(s)=2.76ATeV
• Fluctuating flow angles and anisotropic flow measurements
• Breaking of factorization of two-particle correlations in hydrodynamics
• Collective flow in 2.76 A TeV and 5.02 A TeV Pb+Pb collisions
• Collective flow and long-range correlations in relativistic heavy ion collisions
• Extracting the shear viscosity of the quark-gluon plasma from flow in ultra-central heavy-ion collisions
• Non-flow correlations and elliptic flow fluctuations in gold-gold collisions at sqrt(s_NN)= 200 GeV
• Linear and non-linear flow mode in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 2.76 TeV
• Principal component analysis of event-by-event fluctuations
• Plane correlations and hydrodynamic simulations of heavy ion collisions
• Subleading harmonic flows in hydrodynamic simulations of heavy ion collisions
• Fluctuations of harmonic and radial flow in heavy ion collisions with principal components
• Longitudinal decorrelation measures of flow magnitude and event-plane angles in ultra-relativistic nuclear collisions
• Searches for transverse momentum dependent flow vector fluctuations in Pb-Pb and p-Pb collisions at the LHC
• Principal-component analysis of two-particle azimuthal correlations in PbPb and pPb collisions at CMS
• Principal component analysis of the nonlinear coupling of harmonic modes in heavy-ion collisions
• Nonflow "factorization" and a novel method to disentangle anisotropic flow and nonflow
• Measuring Momentum-Dependent Flow Fluctuations in Heavy-Ion Collisions
• Observation of flow angle and flow magnitude fluctuations in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV at the CERN Large Hadron Collider
• Pseudorapidity dependence of anisotropic flow and its decorrelations using long-range multiparticle correlations in Pb-Pb and Xe-Xe collisions

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