Centrality Dependence of Charged Particle Production at Large Transverse Momentum in Pb--Pb Collisions at $\sqrt{s_{\rm{NN}}} = 2.76$ TeV

B. Abelev , N. Arbor (1) , G. Conesa Balbastre (1) , J. Faivre , C. Furget (1) , R. Guernane (1) , S. Kox (1) , J.S. Real (1) , C. Silvestre (1) , R. Vernet (2) , I. Belikov (3) , B. Hippolyte (3) , C. Kuhn (3) , C. Roy (3) , X. Sanchez Castro (3) , S. Senyukov (3) , Laurent Aphecetche (4) , Guillaume Batigne (4) , E. Bergognon (4) , M. Bregant (4) , H. Delagrange (4) , O. Driga (4) , B. Erazmus (4) , Magali Estienne (4) , Marie Germain (4) , A. Lardeux (4) , F. Lefèvre (4) , L. Luquin (4) , Gines Martinez Garcia (4) , A. Mas (4) , L. Massacrier (4) , A. Matyja (4) , Philippe Pillot (4) , Y. Schutz (4) , Alexandre Shabetai (4) , Diego Stocco (4) , C. Cheshkov (5) , B. Cheynis (5) , L. Ducroux (5) , J.-Y. Grossiord (5) , Maxime Guilbaud (5) , R. Tieulent (5) , A. Uras (5) , Y. Zoccarato (5) , Y.W. Baek (6) , A. Baldit (6) , V. Barret (6) , N. Bastid (6) , P. Crochet (6) , P. Dupieux (6) , R. Ichou (6) , X. Lopez (6) , F. Manso (6) , M. Marchisone (6) , S. Porteboeuf-Houssais (6) , P. Rosnet (6) , B. Vulpescu (6) , X. Zhang (6)

1 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
2 CC-IN2P3 - Centre de Calcul de l'IN2P3
3 DRS-IPHC - Département Recherches Subatomiques
4 SUBATECH - Laboratoire SUBATECH Nantes
5 IPNL - Institut de Physique Nucléaire de Lyon
6 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand

The inclusive transverse momentum ($p_{\rm T}$) distributions of primary charged particles are measured in the pseudo-rapidity range $|\eta|<0.8$ as a function of event centrality in Pb--Pb collisions at $\sqrt{s_{\rm{NN}}}=2.76$ TeV with ALICE at the LHC. The data are presented in the $p_{\rm T}$ range $0.1530$ GeV/$c$. In peripheral collisions (70--80%), the suppression is weaker with $R_{\rm{AA}} \approx 0.7$ almost independently of $p_{\rm T}$. The measured nuclear modification factors are compared to other measurements and model calculations.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]; Physique Nucléaire Expérimentale [nucl-ex]

B. Abelev, N. Arbor, G. Conesa Balbastre, J. Faivre, C. Furget, et al.. Centrality Dependence of Charged Particle Production at Large Transverse Momentum in Pb--Pb Collisions at $\sqrt{s_{\rm{NN}}} = 2.76$ TeV. Physics Letters B, 2013, 720, pp.52-62. ⟨10.1016/j.physletb.2013.01.051⟩. ⟨in2p3-00723981⟩