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

Medientyp: E-Artikel
Titel: 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
Beteiligte: Aad, G.; Abbott, B.; Abeling, K.; Abidi, S. H.; Aboulhorma, A.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Abusleme Hoffman, A. C.; Acharya, B. S.; Adam Bourdarios, C.; Adamczyk, L.; Adamek, L.; Addepalli, S. V.; Adelman, J.; Adiguzel, A.; Adorni, S.; Adye, T.; Affolder, A. A.; Afik, Y.; Agaras, M. N.; Agarwala, J.; Aggarwal, A.; Agheorghiesei, C.; [...]
Erschienen: Springer Science and Business Media LLC, 2023
Erschienen in: Journal of High Energy Physics
Sprache: Englisch
DOI: 10.1007/jhep07(2023)074
ISSN: 1029-8479
Schlagwörter: Nuclear and High Energy Physics
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Beschreibung: <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="http://www.w3.org/1998/Math/MathML"> <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="http://www.w3.org/1998/Math/MathML"> <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="http://www.w3.org/1998/Math/MathML"> <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>
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