Production of charged pions, kaons and (anti-)protons in Pb-Pb and inelastic pp collisions at $\sqrt{_{NN}}=$ 5.02 TeV

S. Acharya , Daniel Dąbrowski , Kamil Deja , Łukasz Graczykowski , Monika Jakubowska , Małgorzata Janik , Adam Kisiel , Julian Myrcha , Piotr Nowakowski , Janusz Oleniacz , Jan Pluta , Przemysław Rokita , Krystian Rosłon , Tomasz Trzciński , Hanna Zbroszczyk

Abstract

Midrapidity production of π±, K± and ($\overline{p}$)p measured by the ALICE experiment at the LHC, in Pb-Pb and inelastic pp collisions at $\sqrt{s_{NN}} = 5.02$ 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 $\sqrt{s_{NN}}= 5.02$ 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 $\sqrt{s_{NN}}= 5.02$ 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 $\sqrt{s_{NN}} = 5.02$ TeV. The results are compared to state-of-the-art model calculations, which are found to describe the observed trends satisfactorily.
Collective authorThe ALICE Collaboration
Author S. Acharya
S. Acharya,,
-
, Daniel Dąbrowski (FP / NPD)
Daniel Dąbrowski,,
- Nuclear Physics Division
, Kamil Deja (FEIT / ICS)
Kamil Deja,,
- The Institute of Computer Science
, Łukasz Graczykowski (FP / NPD)
Łukasz Graczykowski,,
- Nuclear Physics Division
, Monika Jakubowska (FoEE / ICIE)
Monika Jakubowska,,
- The Institute of Control and Industrial Electronics
, Małgorzata Janik (FP / NPD)
Małgorzata Janik,,
- Nuclear Physics Division
, Adam Kisiel (FP / NPD)
Adam Kisiel,,
- Nuclear Physics Division
, Julian Myrcha (FEIT / IN)
Julian Myrcha,,
- The Institute of Computer Science
, Piotr Nowakowski (FEIT / ICS)
Piotr Nowakowski,,
- The Institute of Computer Science
, Janusz Oleniacz (FP / NPD)
Janusz Oleniacz,,
- Nuclear Physics Division
et al.`
Total number of authors1031
Journal seriesPhysical Review C, ISSN 2469-9985, e-ISSN 2469-9993, [1538-4497]
Issue year2020
Vol101
Pages1-27
Publication size in sheets1.3
Article number044907
Keywords in English relativistic heavy ion physics ; quark gluon plasma ; particle and resonance production ; experimental results
ASJC Classification3106 Nuclear and High Energy Physics
DOIDOI:10.1103/PhysRevC.101.044907
URL https://journals.aps.org/prc/abstract/10.1103/PhysRevC.101.044907
Languageen angielski
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 10-06-2020, ArticleFromJournal
Publication indicators WoS Citations = 0; WoS Impact Factor: 2018 = 3.132 (2) - 2018=3.05 (5)
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