Measurement of the distributions of event-by-event flow harmonics in Pb-Pb Collisions at sqrt(s_nn)=2.76 TeV with the ATLAS detector

Abstract

The event-by-event distributions of harmonic flow coefficients v_n for n=2-4 are measured in Pb-Pb collisions at sqrt(s_nn)=2.76 TeV with the ATLAS detector, using charged particles with p_T > 0.5 GeV and |η|<2.5. The shape of the v_n distributions is consistent with Gaussian fluctuations in central collisions for v_2 and over the measured centrality range for v_3 and v_4. When these distributions are rescaled to have the same <v_n>, the resulting shapes are nearly the same for p_T>1 GeV and 0.5<p_T<1 GeV. The v_n distributions are compared with the eccentricity distributions from two initial geometry models: Glauber and the MC-KLN model. Both fail to describe the v_2 data consistently over the full centrality range

4 pages, 5 figures, proceedings of talk at the 23rd International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions, QM2012, August 13-18, 2012, Washington DC

References in corpus (3)

• Glauber Modeling in High Energy Nuclear Collisions
• Measurement of the azimuthal anisotropy for charged particle production in sqrt(s_NN) = 2.76 TeV lead-lead collisions with the ATLAS detector
• Effects of fluctuations on the initial eccentricity from the Color Glass Condensate in heavy ion collisions

Cited by in corpus (6)

• Collective flow and viscosity in relativistic heavy-ion collisions
• Initial state geometry and the role of hydrodynamics in proton-proton, proton-nucleus and deuteron-nucleus collisions
• Hydrodynamics at RHIC and LHC: What have we learned?
• Study of the sensitivity of observables to hot spot size in heavy ion collisions
• Disentangling flow and nonflow correlations via Bayesian unfolding of the event-by-event distributions of harmonic coefficients in ultrarelativistic heavy-ion collisions
• Constraints from $v_2$ fluctuations for the initial state geometry of heavy-ion collisions