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Production of charged pions, kaons, and (anti-)protons in Pb-Pb and inelastic pp collisions at sNN =5.02 TeV

S., Acharya ; Adolfsson, J. LU ; Christiansen, P. LU ; Matonoha, O. LU ; Nassirpour, A. LU orcid ; Oskarsson, A. LU ; Richert, T. LU ; Rueda, Oscar M ; Silvermyr, D. LU orcid and Stenlund, E. LU , et al. (2020) In Physical Review C 101(4).
Abstract
Midrapidity production of π±, K±, and (p¯)p measured by the ALICE experiment at the CERN Large Hadron Collider, 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=2.76 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... (More)
Midrapidity production of π±, K±, and (p¯)p measured by the ALICE experiment at the CERN Large Hadron Collider, 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=2.76 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≈3GeV/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=2.76 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=2.76 TeV. The results are compared to state-of-the-art model calculations, which are found to describe the observed trends satisfactorily. © 2020 American Physical Society. All rights reserved. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review C
volume
101
issue
4
article number
044907
publisher
American Physical Society
external identifiers
  • scopus:85091926671
ISSN
2469-9985
DOI
10.1103/PHYSREVC.101.044907
language
English
LU publication?
yes
id
f5c94625-7e47-41b9-bc44-19c72f8b61f6
date added to LUP
2022-04-05 17:34:30
date last changed
2023-04-02 22:38:52
@article{f5c94625-7e47-41b9-bc44-19c72f8b61f6,
  abstract     = {{Midrapidity production of π±, K±, and (p¯)p measured by the ALICE experiment at the CERN Large Hadron Collider, 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=2.76 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≈3GeV/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=2.76 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=2.76 TeV. The results are compared to state-of-the-art model calculations, which are found to describe the observed trends satisfactorily. © 2020 American Physical Society. All rights reserved.}},
  author       = {{S., Acharya and Adolfsson, J. and Christiansen, P. and Matonoha, O. and Nassirpour, A. and Oskarsson, A. and Richert, T. and Rueda, Oscar M and Silvermyr, D. and Stenlund, E. and N., Zurlo}},
  issn         = {{2469-9985}},
  language     = {{eng}},
  number       = {{4}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review C}},
  title        = {{Production of charged pions, kaons, and (anti-)protons in Pb-Pb and inelastic pp collisions at sNN =5.02 TeV}},
  url          = {{http://dx.doi.org/10.1103/PHYSREVC.101.044907}},
  doi          = {{10.1103/PHYSREVC.101.044907}},
  volume       = {{101}},
  year         = {{2020}},
}