Measurement of the azimuthal anisotropy for charged particle production in sqrt(s_NN) = 2.76 TeV lead-lead collisions with the ATLAS detector

Abstract

Differential measurements of charged particle azimuthal anisotropy are presented for lead-lead collisions at sqrt(s_NN) = 2.76 TeV with the ATLAS detector at the LHC, based on an integrated luminosity of approximately 8 mb^-1. This anisotropy is characterized via a Fourier expansion of the distribution of charged particles in azimuthal angle (phi), with the coefficients v_n denoting the magnitude of the anisotropy. Significant v_2-v_6 values are obtained as a function of transverse momentum (0.5<pT<20 GeV), pseudorapidity (|eta|<2.5) and centrality using an event plane method. The v_n values for n>=3 are found to vary weakly with both eta and centrality, and their pT dependencies are found to follow an approximate scaling relation, v_n^{1/n}(pT) \propto v_2^{1/2}(pT). A Fourier analysis of the charged particle pair distribution in relative azimuthal angle (Dphi=phi_a-phi_b) is performed to extract the coefficients v_{n,n}=<cos (n Dphi)>. For pairs of charged particles with a large pseudorapidity gap (|Deta=eta_a-eta_b|>2) and one particle with pT<3 GeV, the v_{2,2}-v_{6,6} values are found to factorize as v_{n,n}(pT^a,pT^b) ~ v_n(pT^a)v_n(pT^b) in central and mid-central events. Such factorization suggests that these values of v_{2,2}-v_{6,6} are primarily due to the response of the created matter to the fluctuations in the geometry of the initial state. A detailed study shows that the v_{1,1}(pT^a,pT^b) data are consistent with the combined contributions from a rapidity-even v_1 and global momentum conservation. A two-component fit is used to extract the v_1 contribution. The extracted v_1 is observed to cross zero at pT\sim1.0 GeV, reaches a maximum at 4-5 GeV with a value comparable to that for v_3, and decreases at higher pT.

34 pages plus author list (47 pages total), 36 figures, 7 tables, revised author list, matches published PRC version. Additional auxiliary plots can be found at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2011-01/

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• Dependence on beam energy and nuclear equation of state dependence of anisotropic flow and particle production in low-energy heavy-ion collisions
• Dynamical modeling of high energy heavy ion collisions
• Measurements of correlations of anisotropic flow harmonics in Pb--Pb Collisions with ALICE
• Fluctuations of pion flow harmonics and HBT correlation functions in ultrarelativistic heavy ion collisions
• Beam-energy dependence of the azimuthal anisotropic flow from RHIC
• Measurements of identified particle anisotropic flow in Cu+Au and U+U collisions by PHENIX experiment
• Revisiting the centrality definition and observable centrality dependence of relativistic heavy-ion collisions in PACIAE model
• Multiparticle azimuthal cumulants from transverse momentum conservation and collective flow
• INFN What Next: Ultra-relativistic Heavy-Ion Collisions
• Measurement of elliptic and higher order flow harmonics at $\sqrt{s_{NN}}=2.76$ TeV Pb+Pb collisions with the ATLAS Detector
• Hierarchy of kinetic freeze-out parameters in low energy heavy-ion collisions
• Sub-leading flow modes in PbPb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV from HYDJET++ model
• Measurements of the suppression and correlations of dijets in Xe+Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV
• Three-particle correlations in relativistic heavy ion collisions in a multiphase transport model
• Forward-backward multiplicity and momentum correlations in pp and pPb collisions at the LHC energies
• Longitudinal hydrodynamics from event-by-event Landau initial conditions
• Dipole asymmetry at $\sqrt{s_{NN}}=200$ GeV Au+Au Collisions from STAR experiment at RHIC
• Two particle correlation measurements with respect to higher harmonic event planes at PHENIX
• Azimuthal angle correlations at large rapidities: revisiting density variation mechanism
• Probing the profile of bulk matter in p+Pb collisions via directed flow of heavy quarks
• Anisotropic flow of charged and identified hadrons at FAIR energies and its dependence on the nuclear equation of state
• Model studies of fluctuations in the background for jets in heavy ion collisions
• Azimuthal Jet Tomography at RHIC and LHC
• Study of pseudorapidity dependence of the anisotropic flow with ALICE at the LHC
• Observation of long-range collective flow in OO and NeNe collisions and implications for nuclear structure studies
• Thermal noise in non-boost-invariant dissipative hydrodynamics
• Two-particle correlations in p-Pb collisions at the LHC with ALICE
• Collective Effects in Nuclear Collisions: Experimental Overview
• Symmetric cumulant $s{c}_{2,4}\left\{4\right\}$ and asymmetric cumulant $a{c}_2\left\{3\right\}$ from transverse momentum conservation and flow
• Reexamining the iconic dihadron correlation measurement demonstrating jet quenching
• d+Au Hadron Correlation Measurements at PHENIX
• Exploring nuclear structure with multiparticle azimuthal correlations at the LHC
• 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
• Jet Quenching and Correlations
• Feynman Amplitude Approach to study the Passage of a Jet in a Medium
• On the double-ridge effect at the LHC
• Fluctuations in ultra-relativistic heavy ion collisions
• The R_AA and v_2 of muons from heavy-quark decays in Pb+Pb collisions at sqrt(s_NN)=2.76 TeV with the ATLAS detector
• Probing non-linearity of higher order anisotropic flow in Pb--Pb collisions
• Effects of Jets in the Flow Observables
• Hydrodynamical response of plane correlation in Pb+Pb collisions at $\sqrt{s_{\text{NN}}}$=2.76 TeV
• Skewness of the elliptic flow distribution in $\sqrt{s_{{}_{\mathrm{NN}}}}$ = 5.02~TeV PbPb collisions from HYDJET++ model
• Long-range azimuthal correlations for partially coherent pion emission in proton-proton collisions
• LHC: Past, Present, and Future
• Challenging the utility of third-order azimuth harmonics in the description of ultra-relativistic heavy-ion collisions
• Flow fluctuations and kinetic freeze-out of identified hadrons at energies available at the CERN Super Proton Synchrotron
• Exploring Rapidity-Even Dipolar Flow in Isobaric Collisions at RHIC
• Systematic study of flow vector fluctuations in $\sqrt{{\text{s}}_{{}_{\mathbf{NN}}}}=5.02$ TeV Pb-Pb collisions
• Measuring differential particle correlations in relativistic nuclear collisions
• Multiplicity dependence of charm baryon and charm meson production in pPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV
• Parton evolution time dependent transverse shape asymmetry in peripheral Pb-Pb and p-Pb collisions at 5.02 TeV
• Measurement of $v_n$ coefficients and event plane correlations in 2.76 TeV Pb-Pb collisions with ATLAS
• Formulation of relativistic dissipative fluid dynamics and its applications in heavy-ion collisions
• Two particle correlation measurements at PHENIX
• Investigations of $p$+Pb Collisions at Perturbative and Non-Perturbative QCD Scales
• Roundtable: What can we learn about confinement and anomalous effects in QCD using analog systems?
• Intrinsic coupling between transverse spherocity and elliptic flow in heavy-ion collisions
• Overview of new results from ATLAS heavy ion physics program
• Reconstructing jet anisotropies with cumulants
• Azimuthal correlations and collective effects in a heavy-ion collisions at the LHC energies
• The $v_3^{1/3}/v_2^{1/2}$ ratio in PbAu collisions at $\sqrt{s_{\mathrm{NN}}}=$ 17.3 GeV: a hint of a hydrodynamic behavior
• Long-range correlations in proton-lead collisions at sqrt{s_NN} = 5.02 TeV from ATLAS
• Impact of soft QCD effects over intrajet azimuthal anisotropies
• Effect of various particlization scenarios on anisotropic flow and particle production using UrQMD hybrid model
• Collective phenomena in high-energy nuclear collisions
• Characterizing the initial conditions of heavy-ion collisions at the LHC with mean transverse momentum and anisotropic flow correlations
• Anisotropic flow in pp-collisions at the LHC
• Transverse momentum dependent decorrelation in Pb-Pb collisions at LHC
• Triangular flow of negative pions emitted in PbAu collisions at $\sqrt{s_{NN}}=$ 17.3 GeV
• Pseudorapidity dependence of anisotropic flow in heavy ion collisions with ALICE