/ nucl-ex CERN-PH-EP-2013-134

Multi-strange baryon production at mid-rapidity in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV

Published in: Phys.Lett.
Year: 2014
Vol.: B728
Page No: 216-227
Pages: 12
Year: 2014

Abstract: The production of {\Xi}- and {\Omega}- baryons and their anti-particles in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV has been measured using the ALICE detector. The transverse momentum spectra at mid-rapidity (|y| < 0.5) for charged {\Xi} and {\Omega} hyperons have been studied in the range 0.6 < $p_{\rm T}$ < 8.0 GeV/$c$ and 1.2 < $p_{\rm T}$ < 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${\'o}$w and EPOS models give a satisfactory description of the data, with the latter covering a wider $p_{\rm T}$ range. Mid-rapidity yields, integrated over $p_{\rm T}$, have been determined. The hyperon-to-pion ratios are similar to those at RHIC: they rise smoothly with centrality up to $<N_{part}>$ ~ 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.

Note: 18 pages, 5 captioned figures, 1 table, authors from page 13 to page 18, version 2 corrects an error in the plotting of Figure 5. Erratum in preparation for Phys. Lett. B 728 (2014) 216

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DOI: 10.1016/j.physletb.2013.11.048