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Directed flow of charged particles at mid-rapidity relative to the spectator plane in Pb-Pb collisions at sqrt{s_NN}=2.76 TeV

B. Abelev Laurent Aphecetche 1 A. Baldisseri 2 Guillaume Batigne 1 I. Belikov 3 A.A.E. Bergognon 1 H. Borel 2 M. Bregant 1 J. Castillo Castellanos 2 J.L. Charvet 2 B. Cheynis 4 H. Delagrange 1 L. Ducroux 4 B. Erazmus 1 Magali Estienne 1 Marie Germain 1 J.-Y. Grossiord 4 Maxime Guilbaud 4 B. Hippolyte 3 C. Kuhn 3 A. Lardeux 1 J. Martin Blanco 1 Gines Martinez Garcia 1 A. Mas 1 L. Massacrier 1 L. Molnar 3 H. Pereira da Costa 2 Philippe Pillot 1 A. Rakotozafindrabe 1 X. Sanchez Castro 3 Y. Schutz 1 S. Senyukov 3 Alexandre Shabetai 1 Diego Stocco 1 A. Uras 4 R. Vernet 5 Y. Zoccarato 4 N. Arbor 6 G. Conesa Balbastre 6 J. Faivre 6 C. Furget 6 R. Guernane 6 S. Kox 6 J.S. Real 6 C. Silvestre 6 Y.W. Baek 7 V. Barret 7 N. Bastid 7 P. Crochet 7 P. Dupieux 7 R. Ichou 7 S. Li 7 X. Lopez 7 F. Manso 7 M. Marchisone 7 S. Porteboeuf-Houssais 7 P. Rosnet 7 B. Vulpescu 7 X. Zhang 7 Z. Conesa Del Valle 8 I. Das 8 B. Espagnon 8 C. Hadjidakis 8 I. Lakomov 8 C. Suire 8 J. D. Tapia Takaki 8 L. Valencia Palomo 8 
Abstract : The directed flow of charged particles at mid-rapidity is measured in Pb-Pb collisions at sqrt{s_NN}=2.76 TeV relative to the collision plane defined by the spectator nucleons. Both, the rapidity odd (v_1^odd) and even (v_1^even) directed flow components are reported. The v_1^odd component has a negative slope as a function of pseudorapidity similar to that observed at the highest RHIC energy, but with about a three times smaller magnitude. The v^even component is found to be non-zero and independent of pseudorapidity. Both components show little dependence on the collision centrality and change sign at transverse momenta around 1.2-1.7 GeV/c for midcentral collisions. The shape of v_1^even as a function of transverse momentum and a vanishing transverse momentum shift along the spectator deflection for v_1^even are consistent with dipole-like initial density fluctuations in the overlap zone of the nuclei.
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Submitted on : Wednesday, June 19, 2013 - 8:03:16 AM
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B. Abelev, Laurent Aphecetche, A. Baldisseri, Guillaume Batigne, I. Belikov, et al.. Directed flow of charged particles at mid-rapidity relative to the spectator plane in Pb-Pb collisions at sqrt{s_NN}=2.76 TeV. Physical Review Letters, American Physical Society, 2013, 111, pp.232302. ⟨10.1103/PhysRevLett.111.232302⟩. ⟨in2p3-00835541⟩



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