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

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2.76 TeV
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The ALICE experiment at the LHC has measured the production of \csim\ and \omm\ baryons and their anti-particles in \PbPb\ collisions at \snn\ = 2.76 TeV. The transverse momentum spectra at mid-rapidity ($|y|$ $<$ 0.5) for charged \csi\ and \om\ hyperons have been studied in the range 0.6 $<$ \pt $<$ 8.0 \GeV\ and 1.2 $<$ \pt $<$ 7.0 \GeV, 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 \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 \avNpart\ $\sim$ 150 and saturate thereafter. The enhancements (yields per participant nucleon relative to \pp\ collisions) increase both with the strangeness content of the baryon and with centrality, but are less pronounced than at lower energies.

Erratum sent to PLB May, 16, 2014 (by email)