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. 2010 Dec 17;105(25):252302.
doi: 10.1103/PhysRevLett.105.252302. Epub 2010 Dec 13.

Elliptic flow of charged particles in Pb-Pb collisions at sqrt[S(NN)] = 2.76 TeV

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ØvrebekkJ VrlákováB VulpescuA VyushinB WagnerV WagnerR WanD WangY WangY WangK WatanabeJ P WesselsU WesterhoffJ WiechulaJ WikneM WildeA WilkG WilkM C S WilliamsB WindelbandL Xaplanteris KarampatsosH YangS YangS YasnopolskiyJ YiZ YinH YokoyamaI-K YooW YuX YuanI YushmanovE ZabrodinC ZachC ZampolliS ZaporozhetsA ZarochentsevP ZávadaN ZaviyalovH ZbroszczykP ZelnicekA ZeninI ZguraM ZhalovX ZhangD ZhouA ZichichiG ZinovjevY ZoccaratoM ZynovyevALICE Collaboration
Affiliations

Elliptic flow of charged particles in Pb-Pb collisions at sqrt[S(NN)] = 2.76 TeV

K Aamodt et al. Phys Rev Lett. .

Abstract

We report the first measurement of charged particle elliptic flow in Pb-Pb collisions at sqrt[S(NN)] =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<p t<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 p t reaches a maximum of 0.2 near p t =3 GeV/c. Compared to RHIC Au-Au collisions at sqrt[S(NN)] 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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