Anisotropic Flow of Charged Particles in Pb-Pb Collisions at sNN =5.02 TeV

Adam J., P. Christiansen, H. Ljunggren, A. Oskarsson, T. Richert, D. Silvermyr, E. Stenlund, V. Vislavicius, Zyzak M., ALICE Collaboration

Research output: Contribution to journalArticlepeer-review

Abstract

We report the first results of elliptic (v2), triangular (v3), and quadrangular (v4) flow of charged particles in Pb-Pb collisions at a center-of-mass energy per nucleon pair of √sNN=5.02  TeV with the ALICE detector at the CERN Large Hadron Collider. The measurements are performed in the central pseudorapidity region |η|<0.8 and for the transverse momentum range 0.2<pT<5  GeV/c. The anisotropic flow is measured using two-particle correlations with a pseudorapidity gap greater than one unit and with the multiparticle cumulant method. Compared to results from Pb-Pb collisions at √sNN=2.76  TeV, the anisotropic flow coefficients v2, v3, and v4 are found to increase by (3.0±0.6)%, (4.3±1.4)%, and (10.2±3.8)%, respectively, in the centrality range 0%–50%. This increase can be attributed mostly to an increase of the average transverse momentum between the two energies. The measurements are found to be compatible with hydrodynamic model calculations. This comparison provides a unique opportunity to test the validity of the hydrodynamic picture and the power to further discriminate between various possibilities for the temperature dependence of shear viscosity to entropy density ratio of the produced matter in heavy-ion collisions at the highest energies.
Original languageEnglish
Article number132302
JournalPhysical Review Letters
Volume116
Issue number13
DOIs
Publication statusPublished - 2016

Subject classification (UKÄ)

  • Subatomic Physics

Free keywords

  • Anisotropy
  • Binary alloys
  • Colliding beam accelerators
  • Heavy ions
  • Hydrodynamics
  • Temperature distribution
  • Anisotropic flows
  • Cumulant methods
  • Heavy ion collision
  • Hydrodynamic model
  • Large Hadron Collider
  • Temperature dependence
  • Transverse momenta
  • Two particle correlation
  • Lead alloys

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