In this paper measurements are presented of π±, 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 π, 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 cen- trality. The yield of protons normalized to pions is a factor ∼1.5 lower than the expectation from thermal models.

Centrality dependence of π, K, and p production in Pb-Pb collisions at sqrt[s_{NN}]=2.76 TeV

BEOLE', Stefania;L. Bianchi;BOTTA, Elena;BRUNA, ELENA;BUFALINO, STEFANIA;CORRALES MORALES, YASSER;FERRETTI, Alessandro;GAGLIARDI, Martino;GALLIO, Mauro;MASERA, Massimo;MILANO, LEONARDO;OPPEDISANO, Chiara;RUSSO, RICCARDO;SCOMPARIN, ENRICO;SITTA, Mario;VERCELLIN, Ermanno;
2013-01-01

Abstract

In this paper measurements are presented of π±, 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 π, 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 cen- trality. The yield of protons normalized to pions is a factor ∼1.5 lower than the expectation from thermal models.
2013
88
044910
044910
centrality dependence; MESON PRODUCTION
B. Abelev;J. Adam;D. Adamová;A. M. Adare;M. M. Aggarwal;G. Aglieri Rinella;M. Agnello;A. G. Agocs;A. Agostinelli;Z. Ahammed;N. Ahmad;A. Ah...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/142940
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