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Pion, Kaon, and Proton Production in Central Pb--Pb Collisions at $\sqrt{s_{NN}} = 2.76$ TeV

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

Abstract

See paper for full list of authors - 2 figures, to be submitted to PRLIn this Letter we report the first results on $\pi^\pm$, K$^\pm$, p and pbar production at mid-rapidity (|y|<0.5) in central Pb-Pb collisions at sqrt{s_{NN}} = 2.76 TeV, measured by the ALICE experiment at the LHC. The pT distributions and yields are compared to previous results at sqrt{s_{NN}} = 200 GeV and expectations from hydrodynamic and thermal models. The spectral shapes indicate a strong increase of the radial flow velocity with sqrt{s_{NN}}, which in hydrodynamic models is expected as a consequence of the increasing particle density. While the K/pi ratio is in line with predictions from the thermal model, the p/pi ratio is found to be lower by a factor of about 1.5. This deviation from thermal model expectations is still to be understood

Topics: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Publisher: 'American Physical Society (APS)'
Year: 2012
DOI identifier: 10.1103/PhysRevLett.109.252301
OAI identifier: oai:HAL:in2p3-00723478v1
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