Azimuthal anisotropy of neutral pion production in Au+Au collisions at sqrt(s_NN) = 200 GeV: Path-length dependence of jet quenching and the role of initial geometry

Abstract

We have measured the azimuthal anisotropy of pi0's for 1 < pT < 18 GeV/c for Au+Au collisions at sqrt s_NN = 200 GeV. The observed anisotropy shows a gradual decrease in 3 < pT < 7 - 10 GeV/c, but remains positive beyond 10 GeV/c. The magnitude of this anisotropy is under-predicted, up to at least 10 GeV/c, by current perturbative QCD (pQCD) energy-loss model calculations. An estimate of the increase in anisotropy expected from initial-geometry modification due to gluon saturation effects and initial-geometry fluctuations is insufficient to account for this discrepancy. Calculations which implement a path length dependence steeper than what is implied by current pQCD energy-loss models, show reasonable agreement with the data.

384 authors, 6 pages text, 3 figures. Submitted to Phys. Rev. Lett. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

References in corpus (9)

• Glauber Modeling in High Energy Nuclear Collisions
• Dihadron azimuthal correlations in Au+Au collisions at sqrt(s_NN)=200 GeV
• Effects of fluctuations on the initial eccentricity from the Color Glass Condensate in heavy ion collisions
• Systematic Comparison of Jet Energy-Loss Schemes in a realistic hydrodynamic medium
• Gluon energy loss in the gauge-string duality
• Eccentricity fluctuation effects on elliptic flow in relativistic heavy ion collisions
• Quantitative Constraints on the Transport Properties of Hot Partonic Matter from Semi-Inclusive Single High Transverse Momentum Pion Suppression in Au+Au collisions at sqrt(s_NN) = 200 GeV
• A Detailed Study of High-pT Neutral Pion Suppression and Azimuthal Anisotropy in Au+Au Collisions at \sqrt{s_{NN}} = 200 GeV
• Comparing energy loss and $p_{\perp }$-broadening in perturbative QCD with strong coupling $\mathcal{N}=4$ SYM theory

Cited by in corpus (77)

• Measurement of the azimuthal anisotropy for charged particle production in sqrt(s_NN) = 2.76 TeV lead-lead collisions with the ATLAS detector
• 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
• 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
• Strongly Correlated Quantum Fluids: Ultracold Quantum Gases, Quantum Chromodynamic Plasmas, and Holographic Duality
• Observation of direct-photon collective flow in sqrt(s_NN)=200 GeV Au+Au collisions
• Anisotropic flow of charged hadrons, pions and (anti-)protons measured at high transverse momentum in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• D meson elliptic flow in non-central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76TeV
• Azimuthal anisotropy of charged particles at high transverse momenta in PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• Neutral pion production with respect to centrality and reaction plane in Au+Au collisions at sqrt(s_NN)=200 GeV
• Bridging Soft-Hard Transport Properties of Quark-Gluon Plasmas with CUJET3.0
• The Surprising Transparency of the sQGP at LHC
• Azimuthal anisotropy of charged particles with transverse momentum up to 100 GeV in PbPb collisions at sqrt(s[NN]) = 5.02 TeV
• Measurement of the azimuthal anisotropy of charged particles produced in $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV Pb+Pb collisions with the ATLAS detector
• Consistency of Perfect Fluidity and Jet Quenching in semi-Quark-Gluon Monopole Plasmas
• Deviation from quark-number scaling of the anisotropy parameter v_2 of pions, kaons, and protons in Au+Au collisions at sqrt(s_NN) = 200 GeV
• Measurement of the Azimuthal Angle Dependence of Inclusive Jet Yields in Pb+Pb Collisions at sqrt(s(NN))= 2.76 TeV with the ATLAS detector
• Forward-backward eccentricity and participant-plane angle fluctuations and their influences on longitudinal dynamics of collective flow
• Observation of a "Ridge" correlation structure in high multiplicity proton-proton collisions: A brief review
• Azimuthal jet flavor tomography with CUJET2.0 of nuclear collisions at RHIC and LHC
• Components of the elliptic flow in Pb-Pb collisions at 2.76 TeV
• Nuclear modification of leading hadrons and jets within a virtuality ordered parton shower
• Enhancement of jet quenching around phase transition: result from the dynamical holographic model
• Statistical Origin of Constituent-Quark Scaling in the QGP hadronization
• Measurement of elliptic and higher order flow from ATLAS experiment at the LHC
• Examining a reduced jet-medium coupling in Pb+Pb collisions at the Large Hadron Collider
• Challenges in flow background removal in search for the chiral magnetic effect
• Fourier Harmonics of High-pT Particles Probing the Fluctuating Intitial Condition Geometries in Heavy-Ion Collisions
• Azimuthal anisotropy of charged jet production in $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV Pb-Pb collisions
• Heavy Quark Production and Energy Loss
• Quenching of high-pT hadrons: Energy Loss vs Color Transparency
• Shear viscosity of hadrons with K-matrix cross sections
• Azimuthal anisotropy of pi^0 and eta mesons in Au+Au collisions at sqrt(s_NN)=200 GeV
• A Reaction Plane Detector for PHENIX at RHIC
• A study of the correlations between jet quenching observables at RHIC
• Hard Probe of Geometry and Fluctuations in Heavy Ion Collisions at $\sqrt{s_{{}_{NN}}}=$ 0.2, 2.76, and 5.5 TeV
• Recent Heavy Ion Results with the ATLAS Detector at the LHC
• DREENA-A framework as a QGP tomography tool
• Anisotropic flow of identified particles in Pb-Pb collisions at \sqrt{s_{NN}} = 2.76 TeV measured with ALICE at the LHC
• Measurement of the azimuthal anisotropy of neutral pions in PbPb collisions at sqrt(s(NN)) = 2.76 TeV
• Azimuthal anisotropy in a jet absorption model with fluctuating initial geometry in heavy ion collisions
• $\gamma$-hadron spectra in p + Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Responses of the chiral-magnetic-effect-sensitive sine observable to resonance backgrounds in heavy-ion collisions
• Universal scaling dependence of QCD energy loss from data driven studies
• Jet Quenching at LHC
• Interplay between bulk medium evolution and (D)GLV energy loss
• Glauber-based evaluations of the odd moments of the initial eccentricity relative to the even order participant planes
• Jet Tomography of Harmonic Fluctuations in the Initial Condition of Heavy Ion Collisions
• Suppression of away-side jet fragments with respect to the reaction plane in Au+Au collisions at sqrt(s_NN) = 200 GeV
• The Role of QCD Monopoles in Jet Quenching
• Observation of abnormal suppression of ${\mathrm{f}}_0$(980) production in p$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Updated analysis of jet quenching at RHIC and LHC within the light cone path integral approach
• Jet Quenching in Heavy-Ion Collisions - The Transition Era from RHIC to LHC
• Qualitative and Quantitative Energy Loss?
• Sensitivity of Azimuthal Jet Tomography to Early Time Energy-Loss at RHIC and LHC
• Azimuthal anisotropies of reconstructed jets in Pb+Pb collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}$ = 2.76 TeV in a multiphase transport model
• Event-Shape Engineering and Jet Quenching
• Decipher the $R_{{\Psi }_m}$ correlator in search for the chiral magnetic effect in relativistic heavy ion collisions
• Evolution of mechanism of parton energy loss with transverse momentum at RHIC and LHC in relativistic collision of heavy nuclei
• A heuristic description of high-pT hadron production in heavy ion collisions
• System size dependence of nuclear modification and azimuthal anisotropy of jet quenching
• Jet modification via ${\pi }^0$-hadron correlations in Au$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Forward-backward elliptic anisotropy correlation in parton cascade
• Zeroing in on jet quenching: a PHENIX perspective
• The tricky azimuthal dependence of jet quenching at RHIC and LHC via CUJET2.0
• Azimuthal anisotropy ($v_2$) of high-p${}_T$ ${\pi }^0$ and direct $\gamma$ in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
• Back-to-back relative-excess observable in search for the chiral magnetic effect
• Realistic medium-averaging in radiative energy loss
• Weakness or Strength in the Golden Years of RHIC and LHC?
• ${\pi }^0$ Azimuthal Anisotropy in Au+Au Collisions at $\sqrt{s_{NN}}=39-200$ GeV from PHENIX: Collision Energy and Path-Length Dependence of Jet-Quenching and the Role of Initial Geometry
• Azimuthal elliptic anisotropy ($v_{{}_2}$) of high-$p_{{}_T}$ direct $\gamma$ in Au+Au collisions at $\sqrt{s_{{}_{NN}}}$ = 200 GeV
• Solving the $R_{AA}\otimes v_2$ puzzle
• System-size dependence of $\gamma$-jet modifications in heavy-ion collisions
• Studying the QGP with Jets at the LHC and RHIC
• High $p_{\mathrm{T}}$ spectra and anisotropy of light and heavy hadrons
• In-Medium Jet Modification Measured by PHENIX Via two-particle Correlations and High $p_T$ Hadrons in $A+A$ Collisions
• Determination of the Quark Content of Scalar Mesons Using Hydrodynamical Flow in Heavy Ion Collisions