| Thème(s) : |
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| Titre : |
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Anisotropic flow of charged hadrons, pions and (anti-)protons measured at high transverse momentum in Pb-Pb collisions at $\snn=2.76$ TeV |
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| Auteur : |
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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, G. 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, S.U. 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 |
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| Laboratoire : |
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| Résumé : |
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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 $\pt$. |
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| Collaboration/Projet : |
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ALICE |
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| Type de publication : |
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Articles dans des revues avec comité de lecture |
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Date de publication ou d'écriture : |
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2013 |
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| Nom du périodique : |
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| Physics Letters B (Phys. Lett. B) |
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Elsevier |
| ISSN |
0370-2693 |
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| Volume : |
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719 |
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| Page/Article : |
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18-28 |
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| Identifiant local : |
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LPSC12155, SUBATECH-PLASMA |
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| Commentaire : |
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See paper for full list of authors - 16 pages, 4 figures |
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