Particle-yield modification in jet-like azimuthal di-hadron correlations in Pb-Pb collisions at $\sqrt(s_NN)$ = 2.76 TeV

K. Aamodt L. Aphecetche 1 N. Arbor 2 A. Baldisseri 3 A. Baldit 4 V. Barret 4 N. Bastid 4 Guillaume Batigne 1 I. Belikov 5 H. Borel 3 B. Boyer 6 M. Bregant 1 J. Castillo Castellanos 3 J.L. Charvet 3 C. Cheshkov 7 B. Cheynis 8 J.-P. Coffin 5 G. Conesa Balbastre 2 Z. Conesa Del Valle 5 P. Crochet 4 H. Delagrange 1 O. Driga 1 L. Ducroux 8 P. Dupieux 4 B. Espagnon 6 M. Estienne 1 J. Faivre 2 C. Furget 2 M. Germain 1 C. Geuna 3 J.-Y. Grossiord 7 R. Guernane 2 M. Guilbaud 8 C. Hadjidakis 6 B. Hippolyte 5 I. Hrivnacova 6 R. Ichou 4 S. Jangal 5 S. Kox 2 C. Kuhn 5 A. Lardeux 1 Y. Le Bornec 6 F. Lefevre 1 M. Lenhardt 1 X. Lopez 4 L. Luquin 1 A. Maire 5 F. Manso 4 Y. Mao 2 G. Martınez Garcıa 1 A. Mas 1 L. Massacrier 8 A. Michalon 5 S. Pal 3 P. Pillot 1 S. Porteboeuf-Houssais A. Rakotozafindrabe 3 J.S. Real 2 P. Rosnet 4 C. Roy 5 Y. Schutz 1 C. Suire 6 J.D. Tapia Takaki 6 R. Tieulent 8 A. Uras 8 L. Valencia Palomo 6 R. Vernet 9 B. Vulpescu 4 R. Wan 5 H. Yang 3 Y. Zoccarato 8
Abstract : The yield of charged particles associated with high-pT trigger particles (8 < pT < 15 GeV/c) is measured with the ALICE detector in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV relative to proton-proton collisions at the same energy. The conditional per-trigger yields are extracted from the narrow jet-like correlation peaks in azimuthal di-hadron correlations. In the 5% most central collisions, we observe that the yield of associated charged particles with transverse momenta pT > 3 GeV/c on the away-side drops to about 60% of that observed in pp collisions, while on the near-side a moderate enhancement of 20-30% is found.
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Submitted on : Tuesday, October 4, 2011 - 2:00:58 PM
Last modification on : Tuesday, October 4, 2011 - 2:00:58 PM

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K. Aamodt, L. Aphecetche, N. Arbor, A. Baldisseri, A. Baldit, et al.. Particle-yield modification in jet-like azimuthal di-hadron correlations in Pb-Pb collisions at $\sqrt(s_NN)$ = 2.76 TeV. Physical Review Letters, American Physical Society, 2012, 108, pp.092301. <10.1103/PhysRevLett.108.092301>. <in2p3-00628910>

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