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Physics Letters B 719 (2013) 18-28
Anisotropic flow of charged hadrons, pions and (anti-)protons measured at high transverse momentum in Pb-Pb collisions at $\snn=2.76$ TeV
B. Abelev, N. Arbor1, G. Conesa Balbastre1, J. Faivre1, C. Furget1, R. Guernane1, S. Kox1, J.S. Real1, C. Silvestre1, R. Vernet2, I. Belikov3, B. Hippolyte3, S. Jangal3, C. Kuhn3, C. Roy3, X. Sanchez Castro3, S. Senyukov3, R. Wan3, L. Aphecetche4, Guillaume Batigne4, E. Bergognon, M. Bregant4, H. Delagrange4, O. Driga4, M. Estienne4, M. Germain4, A. Lardeux4, F. Lefèvre4, M. Lenhardt4, L. Luquin4, G. Martınez Garcıa4, A. Mas4, L. Massacrier4, A. Matyja4, P. Pillot4, Y. Schutz4, A. Shabetai4, D. Stocco4, Sang Un Ahn5, Y. .W. Baek5, A. Baldit5, V. Barret5, N. Bastid5, P. Crochet5, P. Dupieux5, R. Ichou5, X. Lopez5, F. Manso5, M. Marchisone5, S. Porteboeuf-Houssais5, P. Rosnet5, B. Vulpescu5, X. Zhang5, c. Cheshkov6, B. Cheynis6, L. Ducroux6, M. Guilbaud6, R. Tieulent6, A. Uras6
ALICE Collaboration(s)
(2013)

The elliptic, $v_2$, triangular, $v_3$, and quadrangular, $v_4$, flow coefficients are measured for unidentified charged particles, pions and (anti-)protons in Pb-Pb collisions at $\snn = 2.76$ TeV with the ALICE detector at the Large Hadron Collider. Results obtained with the event plane and four-particle correlation methods are reported for the pseudo-rapidity range $|\eta|<0.8$ at different collision centralities and as a function of transverse momentum, $\pt$, out to $\pt=20$ GeV/$c$. The observed non-zero elliptic and triangular flow depends only weakly on transverse momentum for $\pt>8$ GeV/$c$. The small $\pt$ dependence of the difference between elliptic flow results obtained from two- and four-particle cumulant methods suggests a common origin of flow fluctuations up to $\pt=8$ GeV/$c$. The magnitude of the (anti-)proton elliptic and triangular flow is larger than that of pions out to at least $\pt=8$ GeV/$c$ indicating that the particle type dependence persists out to high $\pt$.
1 :  LPSC - Laboratoire de Physique Subatomique et de Cosmologie
2 :  CC IN2P3 - Centre de Calcul de l'inst. national de phy. nucléaire et de phy. des particules
3 :  DRS-IPHC - Département Recherches Subatomiques
4 :  SUBATECH - Laboratoire SUBATECH Nantes
5 :  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
6 :  IPNL - Institut de Physique Nucléaire de Lyon
Laboratoire de Physique Corpusculaire
Physique/Physique des Hautes Energies - Expérience

Physique/Physique Nucléaire Expérimentale

Physique/Physique Nucléaire Théorique
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1205.5761