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Peter Christiansen Profile

Peter Christiansen

Professor

Peter Christiansen Profile

Correlated Event-by-Event Fluctuations of Flow Harmonics in Pb-Pb Collisions at sNN =2.76 TeV

Author

  • J. Adam
  • D. Adamova
  • M.M Aggarwal
  • G Aglieri Rinella
  • M. Agnello
  • N Agrawal
  • Peter Christiansen
  • Martin Ljunggren
  • Anders Oskarsson
  • Tuva Richert
  • David Silvermyr
  • Evert Stenlund
  • Vytautas Vislavicius
Show all

Summary, in English

We report the measurements of correlations between event-by-event fluctuations of amplitudes of anisotropic flow harmonics in nucleus-nucleus collisions, obtained for the first time using a new analysis method based on multiparticle cumulants in mixed harmonics. This novel method is robust against systematic biases originating from nonflow effects and by construction any dependence on symmetry planes is eliminated. We demonstrate that correlations of flow harmonics exhibit a better sensitivity to medium properties than the individual flow harmonics. The new measurements are performed in Pb-Pb collisions at the center-of-mass energy per nucleon pair of sNN=2.76 TeV by the ALICE experiment at the Large Hadron Collider. The centrality dependence of correlation between event-by-event fluctuations of the elliptic v2 and quadrangular v4 flow harmonics, as well as of anticorrelation between v2 and triangular v3 flow harmonics are presented. The results cover two different regimes of the initial state configurations: geometry dominated (in midcentral collisions) and fluctuation dominated (in the most central collisions). Comparisons are made to predictions from Monte Carlo Glauber, viscous hydrodynamics, ampt, and hijing models. Together with the existing measurements of the individual flow harmonics the presented results provide further constraints on the initial conditions and the transport properties of the system produced in heavy-ion collisions. © 2016 CERN.

Department/s

  • Particle and nuclear physics
  • Department of Physics

Publishing year

2016

Language

English

Publication/Series

Physical Review Letters

Volume

117

Issue

18

Document type

Journal article

Publisher

American Physical Society

Topic

  • Subatomic Physics

Keywords

  • Colliding beam accelerators
  • Heavy ions
  • Lead
  • Tellurium compounds
  • Anisotropic flows
  • Center-of-mass energies
  • Event-by-event fluctuations
  • Heavy ion collision
  • Initial conditions
  • Large Hadron Collider
  • Nucleus-nucleus collision
  • Pb-Pb collisions
  • Harmonic analysis

Status

Published

ISBN/ISSN/Other

  • ISSN: 1079-7114