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Report number arXiv:1404.0495 ; CERN-PH-EP-2014-060 ; CERN-PH-EP-2014-060
Title K*(892)00 and ΦΦ(1020) production in Pb-Pb collisions at sNNsNN = 2.76 TeV
Related titleK*(892)^0 and PHI(1020) production in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV
K*(892)00 and ΦΦ(1020) production in Pb-Pb collisions at sNNsNN = 2.76 TeV
K*(892)00 and ΦΦ(1020) production in Pb-Pb collisions at sNNsNN = 2.76 TeV
Author(s) ALICE Collaboration  Prikaži svih 940 autora
Publication 2015-02-17
Imprint 02 Apr 2014
Number of pages 26
Note Comments: 35 pages, 14 captioned figures, 2 tables, authors from page 30 to page 32
35 pages, 14 captioned figures, 2 tables, authors from page 30, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1153
In: Phys. Rev. C 91 (2015) 024609
DOI 10.1103/PhysRevC.91.024609
Subject category Nuclear Physics - Experiment ; Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ALICE
Free keywords relativistic heavy ion physics ; particle and resonance production ; experimental results ; resonance production ; K*(892) ; phi resonance
Abstract The yields of the K*(892)00 and ΦΦ(1020) resonances are measured in Pb-Pb collisions at sNNsNN = 2.76 TeV through their hadronic decays using the ALICE detector. The measurements are performed in multiple centrality intervals at mid-rapidity (|y|<0.5) in the transverse-momentum ranges 0.3 < pTpT < 5 GeV/c for the K*(892)00 and 0.5 < pTpT < 5 GeV/c for the ΦΦ(1020). The yields of K*(892)00 are suppressed in central Pb-Pb collisions with respect to pp and peripheral Pb-Pb collisions. This suppression is discussed in a scenario in which the K*(892)00 decays during the evolution of the fireball and the decay products scatter, thus escaping detection through invariant-mass reconstruction. In contrast, the ΦΦ(1020) meson, due to its long lifetime, decays outside the fireball. These particles are also used as probes to study the mechanisms of particle production. The shape of the pt distribution of the ΦΦ(1020) meson, but not its yield, is reproduced fairly well by hydrodynamical models for central Pb-Pb collisions. In central Pb-Pb collisions at low and intermediate pTpT, the p/ΦΦ(1020) ratio is flat in pTpT, while the p/ππ and ΦΦ(1020)/ππ ratios show a pronounced increase and have similar shapes to each other. These results indicate that the shapes of the pTpT distributions of these particles in central Pb-Pb collisions are determined predominantly by the particle masses and radial flow. Finally, ΦΦ(1020) production in Pb-Pb collisions is enhanced, with respect to the yield in pp collisions and the yield of charged pions, by an amount similar to the ΛΛ and ΞΞ.
Copyright/License publication: © 2015-2025 CERN (License: CC-BY-3.0)
preprint: © 2014-2025 CERN (License: CC-BY-4.0)



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Email contact: h.oeschler@gsi.de


 Zapis kreiran 2014-04-03, zadnja izmjena 2024-11-27


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