Azimuthal Angle Correlations of Muons Produced via Heavy-Flavor Decays in 5.02 TeV Pb+Pb and pp Collisions with the ATLAS Detector

ATLAS Collaboration

Research output: Contribution to journalArticlepeer-review


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 Formula Presented and Formula Presented collisions at the LHC. The muons are measured with transverse momenta and pseudorapidities satisfying Formula Presented and Formula Presented, respectively. The distributions of azimuthal angle separation Formula Presented for muon pairs having pseudorapidity separation Formula Presented, are measured in different Formula Presented centrality intervals and compared to the same distribution measured in Formula Presented 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 Formula Presented distributions at Formula Presented, 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 Formula Presented distributions, are found to not vary significantly as a function of Formula Presented collision centrality and are similar for Formula Presented and Formula Presented collisions. This observation will provide important constraints on theoretical descriptions of heavy-quark interactions with the quark-gluon plasma.

Original languageEnglish
Article number202301
JournalPhysical Review Letters
Issue number20
StatePublished - 17 May 2024


FundersFunder number
Australian Research Council
La Caixa Banking Foundation
Centre National pour la Recherche Scientifique et Technique
Fundação para a Ciência e a Tecnologia
Investissements d’Avenir Labex
Cooperative Research Centres, Australian Government Department of Industry
National Stroke Foundation
Norwegian Financial Mechanism
Science and Technology Facilities Council
Horizon 2020, ICSC-NextGenerationEU
H2020 Marie Skłodowska-Curie Actions
HORIZON EUROPE Marie Sklodowska-Curie Actions
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Ministry of Science and Technology, Taiwan
Israel Science Foundation
Wallenberg Foundation
Leverhulme Trust
Baden-Württemberg Stiftung
Neubauer Family Foundation
Staatssekretariat für Bildung, Forschung und Innovation
Javna Agencija za Raziskovalno Dejavnost RS
Generalitat de Catalunya
Bundesministerium für Wissenschaft, Forschung und Wirtschaft
Austrian Science Fund
Agencia Nacional de Investigación y Desarrollo
Bundesministerium für Bildung und Forschung
Danmarks Grundforskningsfond
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Karlsruhe Institute of Technology
Göran Gustafssons Stiftelser
European Commission
Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja
U.S. Department of Energy
European Cooperation in Science and Technology
International Council of Shopping Centers
Fundação de Amparo à Pesquisa do Estado de São Paulo
Natural Sciences and Engineering Research Council of Canada
Research Grants Council, University Grants Committee
General Secretariat for Research and Innovation
Nella and Leon Benoziyo Center for Neurological Diseases, Weizmann Institute of Science
GenT Programmes Generalitat Valenciana, Spain
Irish Rugby Football Union
Cantons of Bern and Geneva
Chinese Academy of Sciences
Defence Science Institute
Agencia Nacional de Promoción Científica y Tecnológica
Minerva Foundation
National Research Foundation
Royal Society of South Australia
Generalitat Valenciana
Ministerstvo Školství, Mládeže a Tělovýchovy
National Research Council Canada
Brookhaven National Laboratory
Hong Kong SAR
Alexander von Humboldt-Stiftung
Multiple Sclerosis Scientific Research Foundation
Caring Futures Institute, Flinders University
British Columbia Knowledge Development Fund
Ministry of Education, Culture, Sports, Science and Technology
Horizon 2020 Framework ProgrammeMUCCA-CHIST-ERA-19-XAI-00
Horizon 2020 Framework Programme
Norges ForskningsrådRCN-314472
Norges Forskningsråd
Agence Nationale de la RechercheANR-20-CE31-0013, ANR-11-LABX-0012, ANR-21-CE31-0022
Agence Nationale de la Recherche
H2020 MSC IF101033496
GenT Programmes Generalitat ValencianaCIDEGENT/2019/023, CIDEGENT/2019/027
Center for Advancing Research Impact in SocietyJ1-3010
Center for Advancing Research Impact in Society
Japan Society for the Promotion of Science22H01227, JP21H05085, JP22H04944
Japan Society for the Promotion of Science
Fundación BBVALEO22-1-603
Fundación BBVA
National Natural Science Foundation of ChinaNSFC–12175119, NSFC 12275265
National Natural Science Foundation of China
Narodowa Agencja Wymiany AkademickiejPPN/PPO/2020/1/00002/U/00001
Narodowa Agencja Wymiany Akademickiej
VetenskapsrådetVR 2022-03845
Ministerio de Ciencia e InnovaciónRYC2020-030254-I, RYC2019-028510-I
Ministerio de Ciencia e Innovación
Deutsche ForschungsgemeinschaftDFG–CR 312/5-1
Deutsche Forschungsgemeinschaft
Narodowe Centrum NaukiUMO-2020/37/B/ST2/01043, UMO-2019/34/E/ST2/00393, 2022/47/B/ST2/03059, 2021/42/E/ST2/00350
Narodowe Centrum Nauki
Instituto Nazionale di Fisica Nucleare754496
Instituto Nazionale di Fisica Nucleare
European Research Council948254
European Research Council
European Regional Development FundIDIFEDER/2018/048, LCF/BQ/PI20/11760025
European Regional Development Fund
Fondo Nacional de Desarrollo Científico y Tecnológico1230987, 1190886, 1210400
Fondo Nacional de Desarrollo Científico y Tecnológico
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen ForschungSNSF–PCEFP2_194658, RPG-2020-004
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung


    Dive into the research topics of 'Azimuthal Angle Correlations of Muons Produced via Heavy-Flavor Decays in 5.02 TeV Pb+Pb and pp Collisions with the ATLAS Detector'. Together they form a unique fingerprint.

    Cite this