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Charged-hadron production in pp, p+Pb, Pb+Pb, and Xe+Xe collisions at \sqrt{s_{_\text{NN}}}=5 TeV with the ATLAS detector at the LHC

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 2023, no. 7, 74
Publication date2023
First online date2023-07-10
Abstract

This paper presents measurements of charged-hadron spectra obtained in pp, p+Pb, and Pb+Pb collisions at $ \sqrt{s} $ or $ \sqrt{s_{\textrm{NN}}} $ = 5.02 TeV, and in Xe+Xe collisions at $ \sqrt{s_{\textrm{NN}}} $ = 5.44 TeV. The data recorded by the ATLAS detector at the LHC have total integrated luminosities of 25 pb$^{−1}$, 28 nb$^{−1}$, 0.50 nb$^{−1}$, and 3 μb$^{−1}$, respectively. The nuclear modification factors R$_{pPb}$ and R$_{AA}$ are obtained by comparing the spectra in heavy-ion and pp collisions in a wide range of charged-particle transverse momenta and pseudorapidity. The nuclear modification factor R$_{pPb}$ shows a moderate enhancement above unity with a maximum at p$_{T}$ ≈ 3 GeV; the enhancement is stronger in the Pb-going direction. The nuclear modification factors in both Pb+Pb and Xe+Xe collisions feature a significant, centrality-dependent suppression. They show a similar distinct p$_{T}$-dependence with a local maximum at p$_{T}$ ≈ 2 GeV and a local minimum at p$_{T}$ ≈ 7 GeV. This dependence is more distinguishable in more central collisions. No significant |η|-dependence is found. A comprehensive comparison with several theoretical predictions is also provided. They typically describe R$_{AA}$ better in central collisions and in the p$_{T}$ range from about 10 to 100 GeV.[graphic not available: see fulltext]

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Keywords
  • Heavy Ion Experiments
  • P p: scattering
  • P nucleus: interaction
  • Heavy ion: scattering
  • Lead
  • Xenon
  • Charged particle: hadroproduction
  • Charged particle: transverse momentum
  • Transverse momentum: momentum spectrum
  • Nuclear matter: effect
  • Transverse momentum dependence
  • CERN LHC Coll
  • Enhancement
  • ATLAS
  • Impact parameter: dependence
  • Rapidity dependence
  • Suppression
  • Experimental results
  • 5020 GeV-cms/nucleon
  • 5440 GeV-cms/nucleon
Citation (ISO format)
ATLAS Collaboration. Charged-hadron production in <i>pp</i>, <i>p</i>+Pb, Pb+Pb, and Xe+Xe collisions at <i>\sqrt{s_{_\text{NN}}}=5</i> TeV with the ATLAS detector at the LHC. In: The journal of high energy physics, 2023, vol. 2023, n° 7, p. 74. doi: 10.1007/jhep07(2023)074
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ISSN of the journal1029-8479
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