232 research outputs found
{Multi-strange baryon production at mid-rapidity in Pb-Pb collisions at = 2.76 TeV}
No full textThe production of
Ξ
− and
Ω
− baryons and their anti-particles in Pb–Pb collisions at
√sNN = 2.76 TeV
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
<
p
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 ́ow and EPOS models give a satisfactory
description of the data, with the latter covering a wider
p
T range. Mid-rapidity yields, integrated
over
p
T, have been determined. The hyperon-to-pion ratios are similar to those at RHIC: they rise
smoothly with centrality up to
h
Nparti ∼ 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
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