Elliptic flow of charged particles in Pb-Pb collisions at 2.76 TeV

Details Elliptic flow of charged particles in Pb-Pb collisions at 2.76 TeV Elliptic flow of charged particles in Pb-Pb collisions at 2.76 TeV

2010-11-17

arxiv.org/abs/1011.3914v2

Phys.Rev.Lett.105:252302,2010

Physics

Nuclear Physics

Nuclear Experiment

10 pages, 4 figures, version accepted for PRL

Scientific paper

10.1103/PhysRevLett.105.252302

We report the first measurement of charged particle elliptic flow in Pb-Pb collisions at 2.76 TeV with the ALICE detector at the CERN Large Hadron Collider. The measurement is performed in the central pseudorapidity region (|eta|<0.8) and transverse momentum range 0.2< p_t< 5.0 GeV/c. The elliptic flow signal v_2, measured using the 4-particle correlation method, averaged over transverse momentum and pseudorapidity is 0.087 +/- 0.002 (stat) +/- 0.004 (syst) in the 40-50% centrality class. The differential elliptic flow v_2(p_t) reaches a maximum of 0.2 near p_t = 3 GeV/c. Compared to RHIC Au-Au collisions at 200 GeV, the elliptic flow increases by about 30%. Some hydrodynamic model predictions which include viscous corrections are in agreement with the observed increase.

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