Elliptic flow of charged particles in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV

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2.76 TeV
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We report the first measurement of charged particle elliptic flow in Pb-Pb collisions at sNN=2.76  TeV with the ALICE detector at the CERN Large Hadron Collider. The measurement is performed in the central pseudorapidity region (|η|<0.8) and transverse momentum range 0.2<pt<5.0  GeV/c. The elliptic flow signal v2, measured using the 4-particle correlation method, averaged over transverse momentum and pseudorapidity is 0.087±0.002(stat)±0.003(syst) in the 40%–50% centrality class. The differential elliptic flow v2(pt) reaches a maximum of 0.2 near pt=3  GeV/c. Compared to RHIC Au-Au collisions at sNN=200  GeV, the elliptic flow increases by about 30%. Some hydrodynamic model predictions which include viscous corrections are in agreement with the observed increase.