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Article
Report number arXiv:1910.07678 ; CERN-EP-2019-208
Title Production of charged pions, kaons and (anti-)protons in Pb-Pb and inelastic pp collisions at sNN = 5.02 TeV
Author(s) ALICE Collaboration  Εμφάνιση και των 1034 συγγραφέων
Corporate author(s) The ALICE collaboration
Publication 2020-04-30
Imprint 27 Sep 2019
Number of pages 27
Note 39 pages, 16 captioned figures, 5 tables, authors from page 34, published version, figures at http://alice-publications.web.cern.ch/node/5573
Published in: Phys. Rev. C 101 (2020) 044907
DOI 10.1103/PhysRevC.101.044907
Subject category Particle Physics - Experiment ; hep-ex ; nucl-ex ; Nuclear Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ALICE
Keywords relativistic heavy ion physics ; quark gluon plasma ; particle and resonance production ; experimental results
Abstract Mid-rapidity production of π±, K± and (p¯)p measured by the ALICE experiment at the LHC, in Pb-Pb and inelastic pp collisions at sNN = 5.02 TeV, is presented. The invariant yields are measured over a wide transverse momentum (pT) range from hundreds of MeV/c up to 20 GeV/c. The results in Pb-Pb collisions are presented as a function of the collision centrality, in the range 0-90%. The comparison of the pT-integrated particle ratios, i.e. proton-to-pion (p/π) and kaon-to-pion (K/π) ratios, with similar measurements in Pb-Pb collisions at sNN = 5.02 TeV show no significant energy dependence. Blast-wave fits of the pT spectra indicate that in the most central collisions radial flow is slightly larger at 5.02 TeV with respect to 2.76 TeV. Particle ratios (p/π, K/π) as a function of pT show pronounced maxima at pT 3 GeV/c in central Pb-Pb collisions. At high pT, particle ratios at 5.02 TeV are similar to those measured in pp collisions at the same energy and in Pb-Pb collisions at sNN = 5.02 TeV. Using the pp reference spectra measured at the same collision energy of 5.02 TeV, the nuclear modification factors for the different particle species are derived. Within uncertainties, the nuclear modification factor is particle species independent for high pT and compatible with measurements at sNN = 5.02 TeV. The results are compared to state-of-the-art model calculations, which are found to describe the observed trends satisfactorily.
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Copyright/License preprint: © 2019-2024 CERN (License: CC-BY-4.0)
publication: © 2020-2024 CERN (License: CC-BY-4.0)
Submitted by david.dobrigkeit.chinellato@cern.ch



 


 Δημιουργία εγγραφής 2019-09-27, τελευταία τροποποίηση 2024-11-27


Πλήρες κείμενο:
PhysRevC.101.044907 - Κατέβασμα πλήρες κειμένουPDF
1910.07678 - Κατέβασμα πλήρες κειμένουPDF
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