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K^0_S and {\Lambda} production in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV

B. Abelev Laurent Aphecetche 1 A. Baldisseri 2 V. Barret 3 N. Bastid 3 Guillaume Batigne 1 A.A.E. Bergognon 1 H. Borel 2 M. Bregant 1 J. Castillo Castellanos 2 J.L. Charvet 2 C. Cheshkov 4 B. Cheynis 4 P. Crochet 3 H. Delagrange 1 L. Ducroux 4 P. Dupieux 3 B. Erazmus 1 Magali Estienne 1 Marie Germain 1 J.-Y. Grossiord 4 Maxime Guilbaud 4 B. Hippolyte 5 C. Kuhn 5 X. Lopez 3 F. Manso 3 Gines Martinez Garcia 1 J. Martin Blanco 1 A. Mas 1 L. Massacrier 1 L. Molnar 5 H. Pereira da Costa 2 Philippe Pillot 1 S. Porteboeuf-Houssais 3 A. Rakotozafindrabe 1 P. Rosnet 3 C. Roy 5 X. Sanchez Castro 5 Y. Schutz 1 Alexandre Shabetai 1 Diego Stocco 1 R. Tieulent 4 A. Uras 4 R. Vernet 6 B. Vulpescu 3 H. Yang 2 X. Zhang 3 Y. Zoccarato 4 Y.W. Baek 3 S. Li 3 M. Marchisone 3 N. Arbor 7 G. Conesa Balbastre 7 J. Faivre 7 C. Furget 7 R. Guernane 7 S. Kox 7 J.S. Real 7 C. Silvestre 7 Z. Conesa del Valle 8 I. Das 8 B. Espagnon 8 C. Hadjidakis 8 I. Hřivnáčová 8 I. Lakomov 8 C. Suire 8 J. D. Tapia Takaki 8 L. Valencia Palomo 8 
Abstract : The ALICE measurement of K^0_S and {\Lambda} production at mid-rapidity in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV is presented. The transverse momentum (pT) spectra are shown for several collision centrality intervals and in the pT range from 0.4 GeV/c (0.6 GeV/c for {\Lambda}) to 12 GeV/c. The pT dependence of the {\Lambda}/K^0_S ratios exhibits maxima in the vicinity of 3 GeV/c, and the positions of the maxima shift towards higher pT with increasing collision centrality. The magnitude of these maxima increases by almost a factor of three between most peripheral and most central Pb-Pb collisions. This baryon excess at intermediate pT is not observed in pp interactions at sqrt(s) = 0.9 TeV and at sqrt(s) = 7 TeV. Qualitatively, the baryon enhancement in heavy-ion collisions is expected from radial flow. However, the measured pT spectra above 2 GeV/c progressively decouple from hydrodynamical-model calculations. For higher values of pT, models that incorporate the influence of the medium on the fragmentation and hadronization processes describe qualitatively the pT dependence of the {\Lambda}/K^0_S ratio.
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Submitted on : Tuesday, July 23, 2013 - 8:00:07 AM
Last modification on : Sunday, June 26, 2022 - 11:59:25 AM

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B. Abelev, Laurent Aphecetche, A. Baldisseri, V. Barret, N. Bastid, et al.. K^0_S and {\Lambda} production in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV. Physical Review Letters, American Physical Society, 2013, 111, pp.222301. ⟨10.1103/PhysRevLett.111.222301⟩. ⟨in2p3-00847194⟩

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