Measurement of the azimuthal anisotropy of charged particles produced in $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV Pb+Pb collisions with the ATLAS detector

Abstract

Measurements of the azimuthal anisotropy in lead-lead collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV are presented using a data sample corresponding to 0.49 ${\mathrm{nb}}^{-1}$ integrated luminosity collected by the ATLAS experiment at the LHC in 2015. The recorded minimum-bias sample is enhanced by triggers for "ultra-central" collisions, providing an opportunity to perform detailed study of flow harmonics in the regime where the initial state is dominated by fluctuations. The anisotropy of the charged-particle azimuthal angle distributions is characterized by the Fourier coefficients, $v_2-v_7$, which are measured using the two-particle correlation, scalar-product and event-plane methods. The goal of the paper is to provide measurements of the differential as well as integrated flow harmonics $v_n$ over wide ranges of the transverse momentum, 0.5 $<p_{\mathrm{T}}<$ 60 GeV, the pseudorapidity, $|\eta |<$ 2.5, and the collision centrality $0-80$%. Results from different methods are compared and discussed in the context of previous and recent measurements in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV and 5.02 TeV. In particular, the shape of the $p_{\mathrm{T}}$ dependence of elliptic or triangular flow harmonics is observed to be very similar at different centralities after scaling the $v_n$ and $p_{\mathrm{T}}$ values by constant factors over the centrality interval $0-60$% and the $p_{\mathrm{T}}$ range $0.5<p_{\mathrm{T}}<5$ GeV.

50 pages in total, author list starting page 34, 14 figures, 4 tables, final version published in EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2016-06/

References in corpus (8)

• Glauber Modeling in High Energy Nuclear Collisions
• Dihadron azimuthal correlations in Au+Au collisions at sqrt(s_NN)=200 GeV
• Constraining the Eq. of State of Super-Hadronic Matter from Heavy-Ion Collisions
• Measurement of longitudinal flow de-correlations in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ and 5.02 TeV with the ATLAS detector
• Measurement of flow harmonics with multi-particle cumulants in Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV with the ATLAS detector
• An overview of experimental results from ultra-relativistic heavy-ion collisions at the CERN LHC: bulk properties and dynamical evolution
• QM2017: Status and Key open Questions in Ultra-Relativistic Heavy-Ion Physics
• Properties of the Quark Gluon Plasma: A lattice perspective

Cited by in corpus (57)

• Performance of electron and photon triggers in ATLAS during LHC Run 2
• Running the gamut of high energy nuclear collisions
• Investigations of anisotropic flow using multi-particle azimuthal correlations in pp, p-Pb, Xe-Xe, and Pb-Pb collisions at the LHC
• Theoretical and Experimental Constraints for the Equation of State of Dense and Hot Matter
• DREENA-B framework: first predictions of $R_{AA}$ and $v_2$ within dynamical energy loss formalism in evolving QCD medium
• The Present and Future of QCD
• Measurement of flow harmonics correlations with mean transverse momentum in lead-lead and proton-lead collisions at $\sqrt{s_{NN}}=5.02$ TeV with the ATLAS detector
• Measurement of the azimuthal anisotropy of charged-particle production in Xe+Xe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44$ TeV with the ATLAS detector
• Observable signatures of initial state momentum anisotropies in nuclear collisions
• From hydro to jet quenching, coalescence and hadron cascade: a coupled approach to solving the $R_{AA}\otimes v_2$ puzzle
• Correlations between flow and transverse momentum in Xe+Xe and Pb+Pb collisions at the LHC with the ATLAS detector: a probe of the heavy-ion initial state and nuclear deformation
• Higher harmonic non-linear flow modes of charged hadrons in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Measurement of azimuthal anisotropy of muons from charm and bottom hadrons in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Longitudinal flow decorrelations in Xe+Xe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44$ TeV with the ATLAS detector
• Transverse momentum and process dependent azimuthal anisotropies in $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV $p$+Pb collisions with the ATLAS detector
• Measurement of azimuthal anisotropy of muons from charm and bottom hadrons in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector
• Disentangle contributions to small-system collectivity via scans of light nucleus-nucleus collisions
• Measurements of azimuthal anisotropies of jet production in Pb+Pb collisions at $\sqrt{s_{NN}}=$ 5.02 TeV with the ATLAS detector
• Measurement of substructure-dependent jet suppression in Pb+Pb collisions at 5.02 TeV with the ATLAS detector
• System dependence of away-side broadening and $\alpha$-clustering light nuclei structure effect in dihadron azimuthal correlations
• Exploring the initial stages in heavy-ion collisions with high-pT RAA and v2 theory and data
• DREENA-A framework as a QGP tomography tool
• Medium-induced modification of $Z$-tagged charged particle yields in Pb+Pb collisions at 5.02 TeV with the ATLAS detector
• Production of ${\rm Y}(\text{nS})$ mesons in Pb+Pb and $pp$ collisions at 5.02 TeV
• Measurement of the nuclear modification factor of $b$-jets in 5.02 TeV Pb+Pb collisions with the ATLAS detector
• Collision-System and Beam-Energy Dependence of Anisotropic Flow Fluctuations
• Constraining $\eta /s$ through high-p${}_{\perp }$ theory and data
• Early evolution constrained by high-$p_T$ QGP tomography
• Measures of azimuthal anisotropy in high-energy collisions
• Directed flow of charged particles within idealized viscous hydrodynamics at energies available at the BNL Relativistic Heavy Ion Collider and at the CERN Large Hadron Collider
• Measurements of the suppression and correlations of dijets in Pb+Pb collisions at $\sqrt{s_{{}_{\text{NN}}}}$ = 5.02 TeV
• Non-Gaussian transverse momentum fluctuations from impact parameter fluctuations
• Flavor dependence of jet quenching in heavy-ion collisions from a Bayesian analysis
• Search for magnetic monopole pair production in ultraperipheral Pb+Pb collisions at $\sqrt{s_{{}_{\text{NN}}}}=5.36$ TeV with the ATLAS detector at the LHC
• Jets and elliptic flow correlations at low and high transverse momenta in ultrarelativistic A+A collisions
• Updated analysis of jet quenching at RHIC and LHC within the light cone path integral approach
• Investigations on mixed harmonic cumulants in heavy-ion collisions at the LHC
• Jet radius dependence of dijet momentum balance and suppression in Pb+Pb collisions at 5.02 TeV with the ATLAS detector
• Measurement of the Sensitivity of Two-Particle Correlations in $pp$ Collisions to the Presence of Hard Scatterings
• Jet-temperature anisotropy revealed through high-$p_{\perp }$ data
• Bayesian Constraints on Pre-Equilibrium Jet Quenching and Predictions for Oxygen Collisions
• Impact parameter dependence of anisotropic flow: Bayesian reconstruction in ultracentral nucleus-nucleus collisions
• Shape of the quark gluon plasma droplet reflected in the high-p_T data
• Higher-order symmetry plane correlations in Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Measurements of the suppression and correlations of dijets in Xe+Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV
• Utilizing high-$p_{\perp }$ theory and data to constrain the initial stages of quark-gluon plasma
• Higher order flow coefficients -- A Messenger of QCD medium formed in heavy-ion collisions at the Large Hadron Collider
• Correlation between particle spectra and elliptic flow
• Azimuthal angle correlations of muons produced via heavy-flavor decays in 5.02 TeV Pb+Pb and $pp$ collisions with the ATLAS detector
• Measurement of the nuclear modification factor for muons from charm and bottom hadrons in Pb+Pb collisions at 5.02 TeV with the ATLAS detector
• Azimuthal anisotropies of charged particles with high transverse momentum in Pb+Pb collisions at $\sqrt{s_{{}_{\text{NN}}}}=5.02$ TeV with the ATLAS detector
• Measurement of forward charged hadron flow harmonics in peripheral PbPb collisions at $\sqrt{s_{NN}}=5.02$ TeV with the LHCb detector
• Flow harmonics in heavy ion physics at CMS and ATLAS
• From high $p_{\perp }$ theory and data to inferring anisotropy of Quark-Gluon Plasma
• Beam-energy dependence of correlations between mean transverse momentum and anisotropic flow of charged particles in Au+Au collisions at RHIC
• Nature of particles azimuthal anisotropy at low and high transverse momenta in ultrarelativistic A+A collisions
• The collectivity of transverse momentum fluctuations