Multi-strange baryon production at mid-rapidity in Pb–Pb collisions at √sNN = 2.76 TeV

Abelev, B. and Antičić, Tome and Gotovac, Sven and Mudnić, Eugen and Planinić, Mirko and Simatović, Goran and Šuša, Tatjana and Vicković, Linda and Zyzak, M. (ALICE Collaboration) (2014) Multi-strange baryon production at mid-rapidity in Pb–Pb collisions at √sNN = 2.76 TeV. Physics Letters B, 728. pp. 216-227. ISSN 0370-2693

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Abstract

The production of Ξ− and Ω− baryons and their anti-particles in Pb–Pb collisions at View the MathML source has been measured using the ALICE detector. The transverse momentum spectra at mid-rapidity (|y|<0.5) for charged Ξ and Ω 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 Kraków 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 〈Npart〉∼150 and saturate thereafter. The enhancements (yields per participant nucleon relative to those in pp collisions) increase both with the strangeness content of the baryon and with centrality, but are less pronounced than at lower energies.

Item Type: Article
Keywords: ALICE; PbPb; 2.76 TeV; multi-strange baryon
Date: 2014
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2013 The Authors. Published by Elsevier B. V. Open access under CC BY license. Received 16 September 2013. Received in revised form 18 November 2013. Accepted 21 November 2013. Available online 26 November 2013.
Divisions: Faculty of Science > Department of Physics
Project code: 119-0982887-1006, 098-0982887-2878
Publisher: Elsevier
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 08 Dec 2017 14:13
Last Modified: 08 Dec 2017 14:13
URI: http://digre.pmf.unizg.hr/id/eprint/5746

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