Azimuthal angle correlations of muons produced via heavy-flavor decays in 5.02 TeV Pb+Pb and pp collisions with the ATLAS detector

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Abstract: Angular correlations between heavy quarks provide a unique probe of the quark-gluon plasma created in ultrarelativistic heavy-ion collisions. Results are presented of a measurement of the azimuthal angle correlations between muons originating from semileptonic decays of heavy quarks produced in 5.02 TeV Pb+Pb and ⁢ collisions at the LHC. The muons are measured with transverse momenta and pseudorapidities satisfying
T>4  GeV and | |<2.4, respectively. The distributions of azimuthal angle separation Δ⁢ for muon pairs having pseudorapidity separation |Δ⁢ |>0.8, are measured in different Pb+Pb centrality intervals and compared to the same distribution measured in ⁢ collisions at the same center-of-mass energy. Results are presented separately for muon pairs with opposite-sign charges, same-sign charges, and all pairs. A clear peak is observed in all Δ⁢ distributions at Δ⁢ ∼ , consistent with the parent heavy-quark pairs being produced via hard-scattering processes. The widths of that peak, characterized using Cauchy-Lorentz fits to the Δ⁢ distributions, are found to not vary significantly as a function of Pb+Pb collision centrality and are similar for ⁢ and Pb+Pb collisions. This observation will provide important constraints on theoretical descriptions of heavy-quark interactions with the quark-gluon plasma

Standort
Deutsche Nationalbibliothek Frankfurt am Main
Umfang
Online-Ressource
Sprache
Englisch
Anmerkungen
Physical review letters. - 132, 20 (2024) , 202301, ISSN: 1079-7114

Ereignis
Veröffentlichung
(wo)
Freiburg
(wer)
Universität
(wann)
2024
Urheber
Beteiligte Personen und Organisationen
Experimentelle Teilchenphysik
Experimentelle Teilchenphysik, Abt. Prof. Dr. Gregor Herten
Experimentelle Teilchenphysik, Abt. Prof. Karl Jakobs
Experimentelle Teilchenphysik, Abt. Prof. Schumacher

DOI
10.1103/physrevlett.132.202301
URN
urn:nbn:de:bsz:25-freidok-2582912
Rechteinformation
Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Letzte Aktualisierung
15.08.2025, 07:30 MESZ

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