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

Aad, G, Abbott, B, Abeling, K, Abidi, SH, Aboulhorma, A, Abramowicz, H, Abreu, H, Abulaiti, Y, Abusleme Hoffman, AC, Acharya, BS
et al (show 2869 more authors) (2023) Charged-hadron production in pp, p+Pb, Pb+Pb, and Xe+Xe collisions at $$ \sqrt{s_{\textrm{NN}}} $$ = 5 TeV with the ATLAS detector at the LHC. Journal of High Energy Physics, 2023 (7).

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<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>This paper presents measurements of charged-hadron spectra obtained in <jats:italic>pp</jats:italic>, <jats:italic>p</jats:italic>+Pb, and Pb+Pb collisions at <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \sqrt{s} $$</jats:tex-math><mml:math xmlns:mml=""> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> or <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \sqrt{s_{\textrm{NN}}} $$</jats:tex-math><mml:math xmlns:mml=""> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mi>NN</mml:mi> </mml:msub> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 5<jats:italic>.</jats:italic>02 TeV, and in Xe+Xe collisions at <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \sqrt{s_{\textrm{NN}}} $$</jats:tex-math><mml:math xmlns:mml=""> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mi>NN</mml:mi> </mml:msub> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 5<jats:italic>.</jats:italic>44 TeV. The data recorded by the ATLAS detector at the LHC have total integrated luminosities of 25 pb<jats:sup><jats:italic>−</jats:italic>1</jats:sup>, 28 nb<jats:sup><jats:italic>−</jats:italic>1</jats:sup>, 0.50 nb<jats:sup><jats:italic>−</jats:italic>1</jats:sup>, and 3 <jats:italic>μ</jats:italic>b<jats:sup><jats:italic>−</jats:italic>1</jats:sup>, respectively. The nuclear modification factors <jats:italic>R</jats:italic><jats:sub><jats:italic>p</jats:italic>Pb</jats:sub> and <jats:italic>R</jats:italic><jats:sub>AA</jats:sub> are obtained by comparing the spectra in heavy-ion and <jats:italic>pp</jats:italic> collisions in a wide range of charged-particle transverse momenta and pseudorapidity. The nuclear modification factor <jats:italic>R</jats:italic><jats:sub><jats:italic>p</jats:italic>Pb</jats:sub> shows a moderate enhancement above unity with a maximum at <jats:italic>p</jats:italic><jats:sub>T</jats:sub> ≈ 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 <jats:italic>p</jats:italic><jats:sub>T</jats:sub>-dependence with a local maximum at <jats:italic>p</jats:italic><jats:sub>T</jats:sub> ≈ 2 GeV and a local minimum at <jats:italic>p</jats:italic><jats:sub>T</jats:sub> ≈ 7 GeV. This dependence is more distinguishable in more central collisions. No significant |<jats:italic>η</jats:italic>|-dependence is found. A comprehensive comparison with several theoretical predictions is also provided. They typically describe <jats:italic>R</jats:italic><jats:sub>AA</jats:sub> better in central collisions and in the <jats:italic>p</jats:italic><jats:sub>T</jats:sub> range from about 10 to 100 GeV.</jats:p>

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 09 Aug 2023 10:18
Last Modified: 09 Aug 2023 10:18
DOI: 10.1007/jhep07(2023)074
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