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Multi-strange baryon production at mid-rapidity in Pb-Pb collisions at sqrt(s_NN) = 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 I. Lakomov 8 C. Suire 8 J. D. Tapia Takaki 8 L. Valencia Palomo 8 
Abstract : The ALICE experiment at the LHC has measured the production of {\Xi}- and {\Omega}- baryons and their anti-particles in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV. The transverse momentum spectra at mid-rapidity (|y| < 0.5) for charged {\Xi} and {\Omega} hyperons have been studied in the range 0.6 < pT < 8.0 GeV/c and 1.2 < pT < 7.0 GeV/c, respectively, and in several centrality intervals (from the most central 0-10% to the most peripheral 60-80% collisions). These spectra have been compared with the predictions of recent hydrodynamic models. In particular, the Krak{ó}w and EPOS models give a satisfactory description of the data, with the latter covering a wider pT range. Mid-rapidity yields, integrated over pT, have been determined. The hyperon-to-pion ratios are similar to those at RHIC: they rise smoothly with centrality up to ~ 150 and saturate thereafter. The enhancements (yields per participant nucleon relative to p-p collisions) increase both with the strangeness content of the baryon and with centrality, but are less pronounced than at lower energies.
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Submitted on : Tuesday, July 23, 2013 - 8:05:01 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.. Multi-strange baryon production at mid-rapidity in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV. Physics Letters B, Elsevier, 2014, 728, pp.216-227. ⟨10.1016/j.physletb.2013.11.048⟩. ⟨in2p3-00847195⟩

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