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Centrality, rapidity and transverse momentum dependence of J/Psi suppression in Pb-Pb collisions at sqrt(sNN)=2.76TeV

B. Abelev Laurent Aphecetche 1 Y.W. Baek 2 N. Bastid 2 Guillaume Batigne 1 A.A.E. Bergognon 1 M. Bregant 1 C. Cheshkov 3 B. Cheynis 3 P. Crochet 2 H. Delagrange 1 L. Ducroux 3 P. Dupieux 2 B. Erazmus 1 Marie Germain 1 J.-Y. Grossiord 3 Maxime Guilbaud 3 B. Hippolyte 4 J.-C. Ianigro 3 C. Kuhn 4 A. Lardeux 1 S. Li 2 X. Lopez 2 F. Manso 2 M. Marchisone 2 G. Mart'Nez Garcia 1 J. Martin Blanco 1 A. Mas 1 A. Morreale 1 Philippe Pillot 1 S. Porteboeuf-Houssais 2 L. Ronflette 1 P. Rosnet 2 C. Roy 1 X. Sanchez Castro 4 Y. Schutz 1 Alexandre Shabetai 1 Diego Stocco 1 R. Tieulent 3 A. Uras 3 L. Valencia Palomo 2 R. Vernet 5 B. Vulpescu 2 M. Wang 1 X. Zhang 2 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 Z. Conesa Del Valle 7 I. Das 7 B. Espagnon 7 C. Hadjidakis 7 I. Lakomov 7 C. Suire 7 J. D. Tapia Takaki 7 L. Valencia Palomo 7 Alberto Baldisseri 8 Herve Borel 8 Javier Castillo Castellanos 8 Jean-Luc Charvet 8 Hugo Pereira da Costa 8 A Rakotozafindrabe 8 
Abstract : The inclusive J/Psi nuclear modification factor Raa in Pb-Pb collisions at sqrt(sNN)=2.76TeV has been measured by ALICE as a function of centrality in the e+e- decay channel at mid-rapidity |y| < 0.8 and as a function of centrality, transverse momentum and rapidity in the u+u- decay channel at forward-rapidity 2.5 < y < 4.The J/Psi yields measured in Pb-Pb are suppressed compared to those in pp collisions scaled by the number of binary collisions.The Raa integrated over a centrality range corresponding to 90% of the inelastic Pb-Pb cross section is 0.72 +- 0.06 (stat.) +- 0.10 (syst.) at mid-rapidity and 0.57 +- 0.01 (stat.) +- 0.09 (syst.) at forward-rapidity.At low transverse momentum, significantly larger values of Raa are measured at forward-rapidity compared to measurements at lower energy.These features suggest that a contribution to the J/Psi yield originates from charm quarks (re)combination in the deconfined partonic medium.
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Submitted on : Monday, November 4, 2013 - 8:11:55 AM
Last modification on : Sunday, June 26, 2022 - 11:59:59 AM

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B. Abelev, Laurent Aphecetche, Y.W. Baek, N. Bastid, Guillaume Batigne, et al.. Centrality, rapidity and transverse momentum dependence of J/Psi suppression in Pb-Pb collisions at sqrt(sNN)=2.76TeV. Physics Letters B, Elsevier, 2014, 734, pp.314-327. ⟨10.1016/j.physletb.2014.05.064⟩. ⟨in2p3-00879452⟩

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