In this paper measurements are presented of pion±, K±, p, and p ̄ production at midrapidity (|y| < 0.5), in Pb-Pb collisions at √sNN = 2.76 TeV as a function of centrality. The measurement covers the transverse-momentum (pT ) range from 100, 200, and 300 MeV/c up to 3, 3, and 4.6 GeV/c for pion, K, and p, respectively. The measured pT distributions and yields are compared to expectations based on hydrodynamic, thermal and recombination models. The spectral shapes of central collisions show a stronger radial flow than measured at lower energies, whichcanbedescribedinhydrodynamicmodels.Inperipheralcollisions,thepT distributionsarenotwellrepro- duced by hydrodynamic models. Ratios of integrated particle yields are found to be nearly independent of centrality. The yield of protons normalized to pions is a factor ∼1.5 lower than the expectation from thermal models.

Centrality dependence of pion, Kaon, and proton production in Pb-Pb collisions at √sNN=2.76 TeV

DE CARO, ANNALISA;DE GRUTTOLA, DANIELE;DE PASQUALE, Salvatore;FUSCO GIRARD, Mario;PAGANO, PAOLA;VIRGILI, Tiziano;
2013

Abstract

In this paper measurements are presented of pion±, K±, p, and p ̄ production at midrapidity (|y| < 0.5), in Pb-Pb collisions at √sNN = 2.76 TeV as a function of centrality. The measurement covers the transverse-momentum (pT ) range from 100, 200, and 300 MeV/c up to 3, 3, and 4.6 GeV/c for pion, K, and p, respectively. The measured pT distributions and yields are compared to expectations based on hydrodynamic, thermal and recombination models. The spectral shapes of central collisions show a stronger radial flow than measured at lower energies, whichcanbedescribedinhydrodynamicmodels.Inperipheralcollisions,thepT distributionsarenotwellrepro- duced by hydrodynamic models. Ratios of integrated particle yields are found to be nearly independent of centrality. The yield of protons normalized to pions is a factor ∼1.5 lower than the expectation from thermal models.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/4255475
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