Event by event di-hadron correlations in Pb-Pb 2.76 TeV collisions from the ALICE experiment

Abstract

The large multiplicities at the LHC may permit flow harmonics to be determined on an event by event basis in Pb-Pb collisions. We extract these harmonics from event by event di-hadron correlations. Within a fine centrality bin, we find the correlation function varies substantially on an event by event basis, indicating large fluctuations in the initial conditions for a given impact parameter. Such large fluctuations lead to some events being highly triangular or highly elliptical, where the angular correlation function is completely dominated by the respective second and third Fourier harmonics. We will show unfolded $v_2$ distributions for various centralities, and implications for our understanding of the initial conditions.

4 pages, Hot Quarks 2012

References in corpus (3)

• Triangular flow in hydrodynamics and transport theory
• Event-by-event distributions of azimuthal asymmetries in ultrarelativistic heavy-ion collisions
• Elliptic flow in the Gaussian model of eccentricity fluctuations

Cited by in corpus (11)

• Event-by-event fluctuations in perturbative QCD + saturation + hydro model: pinning down QCD matter shear viscosity in ultrarelativistic heavy-ion collisions
• Multi-particle azimuthal correlations in p-Pb and Pb-Pb collisions at the CERN Large Hadron Collider
• Paramagnetic squeezing of QCD matter
• Longitudinal Decorrelation of Anisotropic Flows in Heavy-ion Collisions at the CERN Large Hadron Collider
• Study of the sensitivity of observables to hot spot size in heavy ion collisions
• Gravitational collisions and the quark-gluon plasma
• Constraints from $v_2$ fluctuations for the initial state geometry of heavy-ion collisions
• Initial conditions from the shadowed Glauber model
• Collective Flow of QCD Matter: a Historical Introduction
• Anisotropic Flow and Jet Quenching in Relativistic Nuclear Collisions
• Initial conditions from the shadowed Glauber model for Pb+Pb at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV