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

K. Aamodt Laurent Aphecetche 1 Guillaume Batigne 1 Z. Conesa del Valle 1 H. Delagrange 1 M.L Dialinas 1 O. Driga 1 M.I Estienne 1 Marie Germain 1 R. Ichou 1 A. Lardeux 1 N. Le Bris 1 F. Lefevre 1 M. Lenhardt 1 L. Luquin 1 Gines Martinez Garcia 1 A. Matyja 1 Philippe Pillot 1 Daniel Roy 1 Y. Schutz 1 Diego Stocco 1 M. Anfreville 2 A. Baldisseri 2 H. Borel 2 J. Castillo Castellanos 2 J.-L. Charvet 2 C. Geuna 2 S. Pal 2 A. Rakotozafindrabe 2 H. Yang 2 C. Cheshkov 3 B. Cheynis 4 L. Ducroux 4 J.-Y. Grossiord 3 L. Massacrier 4 F. Nendaz 4 R. Tieulent 4 Y. Zoccarato 4 R. Vernet 5 N. Arbor 6 J. Faivre 6 C. Furget 6 S. Gadrat 6 R. Guernane 6 S. Kox 6 Y. Mao 6 J. Real 6 L. Bimbot 7 B. Boyer 7 A. Charpy 7 B. Espagnon 7 V. Latage 7 Y. Le Bornec 7 M. Lopez Noriega 7 M. Malek 7 J. Pouthas 7 J. D. Tapia Takaki 7 N. Willis 7 Sang Un Ahn 8 Y.W. Baek 9 A. Baldit 9 V. Barret 9 N. Bastid 9 A. Blanc 9 P. Crochet 9 P. Dupieux 9 X. Lopez 9 Loïc Manceau 9 F. Manso 9 P. Rosnet 9 P. Saturnini 9 X. Zhang 9
Abstract : 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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Submitted on : Friday, November 19, 2010 - 11:34:19 AM
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K. Aamodt, Laurent Aphecetche, Guillaume Batigne, Z. Conesa del Valle, H. Delagrange, et al.. Elliptic flow of charged particles in Pb-Pb collisions at 2.76 TeV. Physical Review Letters, American Physical Society, 2010, 105, pp.252302. ⟨10.1103/PhysRevLett.105.252302⟩. ⟨in2p3-00537767⟩

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