Charge separation relative to the reaction plane in Pb-Pb collisions at $\sqrt{s_{NN}}= 2.76$ TeV

B. Abelev L. Aphecetche 1 A. Baldisseri 2 A.A.E. Bergognon 1 H. Borel 2 J. Castillo Castellanos 2 J.L. Charvet 2 C. Cheshkov 3 B. Cheynis 3 H. Delagrange 1 O. Driga 1 L. Ducroux 3 B. Erazmus 1 M. Estienne 1 M. Germain 1 C. Geuna 2 J.-Y. Grossiord 3 M. Guilbaud 3 B. Hippolyte 4 C. Kuhn 4 A. Lardeux 1 F. Lefevre 1 L. Luquin 1 G. Martınez Garcıa 1 A. Mas 1 L. Massacrier 1 H. Pereira da Costa 2 P. Pillot 1 A. Rakotozafindrabe 2 C. Roy 4 X. Sanchez Castro 4 Y. Schutz 1 D. Stocco 1 R. Tieulent 3 A. Uras 3 R. Vernet 5 Y. Zoccarato 3 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 Sang Un Ahn 7 Y.W. Baek 8 A. Baldit 8 V. Barret 8 N. Bastid 8 P. Crochet 8 P. Dupieux 8 R. Ichou 8 X. Lopez 8 F. Manso 8 M. Marchisone 8 S. Porteboeuf-Houssais 8 P. Rosnet 8 B. Vulpescu 8 X. Zhang 8 B. Boyer 6 I. Das 9 B. Espagnon 9 C. Hadjidakis 9 I. Hřivnáčová 9 I. Lakomov 9 Y. Le Bornec 9 C. Suire 9 J. D. Tapia Takaki 9 L. Valencia Palomo 9
Abstract : Measurements of charge dependent azimuthal correlations with the ALICE detector at the LHC are reported for Pb-Pb collisions at $\sqrt{s_{NN}} = 2.76$ TeV. Two- and three-particle charge-dependent azimuthal correlations in the pseudo-rapidity range $|\eta | < 0.8$ are presented as a function of the collision centrality, particle separation in pseudo-rapidity, and transverse momentum. A clear signal compatible with the expectation of a charge-dependent separation relative to the reaction plane is observed, which shows little or no collision energy dependence when compared to measurements at RHIC energies. Models incorporating effects of local parity violation in strong interactions fail to describe the observed collision energy dependence.
Type de document :
Article dans une revue
Physical Review Letters, American Physical Society, 2013, 110, pp.012301. <10.1103/PhysRevLett.110.012301>


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B. Abelev, L. Aphecetche, A. Baldisseri, A.A.E. Bergognon, H. Borel, et al.. Charge separation relative to the reaction plane in Pb-Pb collisions at $\sqrt{s_{NN}}= 2.76$ TeV. Physical Review Letters, American Physical Society, 2013, 110, pp.012301. <10.1103/PhysRevLett.110.012301>. <in2p3-00714568>

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