In this paper measurements are presented of π±, K±, p, and p(bar) 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, which can be described in hydrodynamic models. In peripheral collisions, the pT distributions are not well reproduced 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 π, K, and p production in Pb-Pb collisions at sqrt[s_{NN}]=2.76 TeV

LEA, RAMONA;RUI, RINALDO;
2013-01-01

Abstract

In this paper measurements are presented of π±, K±, p, and p(bar) 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, which can be described in hydrodynamic models. In peripheral collisions, the pT distributions are not well reproduced 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.
2013
Esperti anonimi
Inglese
ELETTRONICO
88
044910-1
044910-23
223
HEAVY-ION COLLISIONS; QUARK-GLUON PLASMA; NUCLEUS-NUCLEUS COLLISIONS; QCD PHASE-TRANSITION; TOTAL CROSS-SECTIONS; CHEMICAL FREEZE-OUT; HADRON-PRODUCTION
973
info:eu-repo/semantics/article
262
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., Ah...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11379/537453
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