Measurement of substructure-dependent suppression of large-radius jets with charged particles in Pb+Pb collisions with ATLAS

Measurements of jet substructure in Pb+Pb collisions provide key insights into the mechanism of jet quenching in the hot and dense QCD medium created in these collisions. This Letter presents a measurement of the suppression of large-radius jets with a radius parameter of R = 1.0 and its dependence on the jet substructure. The measurement uses 1.72 nb − 1 of Pb+Pb data and 255 pb − 1 of p p data, both at s NN = 5.02 TeV, recorded with the ATLAS detector at the Large Hadron Collider. Large-radius jets are reconstructed by reclustering R = 0.2 calorimetric jets and are measured for transverse momentum above 200 GeV. Jet substructure is evaluated using charged-particle tracks, and the overall level of jet suppression is quantified using the jet nuclear modification factor ( R AA ). The jet R AA is measured as a function of jet p T , the charged k t splitting scale ( d 12 ), and the angular separation ( Δ R 12 ) of two leading sub-jets. The jet R AA gradually decreases with increasing d 12 , implying significantly stronger suppression of large-radius jets with larger k t splitting scale. The jet R AA gradually decreases for Δ R 12 in the range 0.01 − 0.2 and then remains consistent with a constant for Δ R 12 ≳ 0.2 . The observed significant dependence of jet suppression on the jet substructure will provide new insights into its role in the quenching process.

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Journal
Physics Letters B
Published
2025-11-07
DOI
https://doi.org/10.1016/j.physletb.2025.139929
Primary Topic
High-Energy Particle Collisions Research
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article
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article

Measurement of substructure-dependent suppression of large-radius jets with charged particles in Pb+Pb collisions with ATLAS

Yu. Volkotrub, M. Baselga, J. Hoya, G. Aielli et al.
Physics Letters B
High-Energy Particle Collisions Research
article

Measurement of substructure-dependent suppression of large-radius jets with charged particles in Pb+Pb collisions with ATLAS

Yu. Volkotrub, M. Baselga, J. Hoya, G. Aielli, Anke Ackermann, B. P. Kerridge, Marten Zefanja Barel, M. N. Agaras, J. Niermann, L. Ferencz, M. Aleksa, M. Marjanović, A. Ambler, T. Nobe, B. Stelzer, Yinmiao Wang, B. Abbott, Matthew Leigh, A. Cerri, D. Duda, M. Bauce, P. A. Ekman, C. Alexa, F. Bartels, J. H. Foo, A. De Maria, V. A. Schegelsky, A. Pacheco Pages, S. Alderweireldt, H. D. Pandya, Eva Mayer, N. Berger, C. Sawyer, Yu. A. Tikhonov, H. L. Snoek, J. Wilkinson, B. Kónya, H. Imam, M. Pinamonti, C. P. Hays, M. Lazzaroni, R. Novotny, G. Brianti, S. Kabana, M. Lu, M. G. Alviggi, W. C. Fisher, D. R. Tovey, Kang Liu, A. Held, G. A. Bird, H. Chen, D. Amidei, F. Tsai, J. Albert, M. Gignac, E. Nagy, C. Lacasta, O. Zormpa, R. Tafirout, D. Akiyama, A. G. Bogdanchikov, I. Naryshkin, Y. El Ghazali, F. Morodei, O. Smirnova, A. S. Cerqueira, A. K. Kvam, C. Agheorghiesei, N. Kimura, A. Kupich, A. G. Goussiou, W. Vandelli, G. Cowan, A. J. Beddall, O. Miu, T. J. Khoo, N. Huseynov, M. Rimoldi, N. 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Li, T. F. Lee, Zhichen Wang, S. Li, H. Li, L. Fountas, Y. Zhang, Y. Zhang, Y. Zhang, I. N. Potrap, E. Vilucchi, A. Polini, M. Begalli, Y. W. Liu, C. E. Pandini, J. P. Rutherfoord, C. Gemme, Zonghuan Duan, W. J. Murray, Fred Luehring, H. Evans, V. Pleskot, Siranush Asatryan, A. Vaitkus, Victor Hugo Ruelas Rivera, P. F. Giraud, Snigdho Chakraborty, Safa Gaid, M. Saito, Z. Tao, B. J. Gilbert, Matthew Fewell, F. Malek, V.S. Martoiu, P. Mastrandrea, H. Rasheed, S. Saha, H. H. Williams, M. E. Horstmann, F. Fiedler, Bhupesh Dixit, M. Errenst, P. A. Love, M. A. Aparo, A. Rej, Emily Rose Duden, R. Shaheen, H. Hamdaoui, D. Pietreanu, G. Quetant, J. Strandberg, T. Geralis, J. Proudfoot, Sam Roberts, Shubham Gupta, Yi He
article en

Abstract

Measurements of jet substructure in Pb+Pb collisions provide key insights into the mechanism of jet quenching in the hot and dense QCD medium created in these collisions. This Letter presents a measurement of the suppression of large-radius jets with a radius parameter of R = 1.0 and its dependence on the jet substructure. The measurement uses 1.72 nb − 1 of Pb+Pb data and 255 pb − 1 of p p data, both at s NN = 5.02 TeV, recorded with the ATLAS detector at the Large Hadron Collider. Large-radius jets are reconstructed by reclustering R = 0.2 calorimetric jets and are measured for transverse momentum above 200 GeV. Jet substructure is evaluated using charged-particle tracks, and the overall level of jet suppression is quantified using the jet nuclear modification factor ( R AA ). The jet R AA is measured as a function of jet p T , the charged k t splitting scale ( d 12 ), and the angular separation ( Δ R 12 ) of two leading sub-jets. The jet R AA gradually decreases with increasing d 12 , implying significantly stronger suppression of large-radius jets with larger k t splitting scale. The jet R AA gradually decreases for Δ R 12 in the range 0.01 − 0.2 and then remains consistent with a constant for Δ R 12 ≳ 0.2 . The observed significant dependence of jet suppression on the jet substructure will provide new insights into its role in the quenching process.

Physics Letters BVol. 871
Northern Illinois University (US), New York University Abu Dhabi (AE), The Abdus Salam International Centre for Theoretical Physics (ICTP) (IT), Mohammed V University (MA), Rutherford Appleton Laboratory (GB), Centre National de la Recherche Scientifique (FR), Tel Aviv University (IL), Southern Methodist University (US), TU Dortmund University (DE), Brookhaven National Laboratory (US), Université Paris Cité (FR), Aix-Marseille Université (FR), Heidelberg University (DE), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Laboratoire d’Annecy de Physique des Particules (FR), SLAC National Accelerator Laboratory (US), Laboratoire AstroParticule et Cosmologie (FR), University of Manchester (GB), Centre de physique des particules de Marseille (FR), Türkisch-Deutsche Universität (TR), Laboratoire de Physique Nucléaire et de Hautes Énergies (FR), CEA Paris-Saclay (FR), Institut National de Physique Nucléaire et de Physique des Particules (FR), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR), Laboratoire de Physique Subatomique et de Cosmologie (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Trieste (IT), Institut de Recherche sur les Lois Fondamentales de l'Univers (FR), Laboratoire des 2 Infinis Toulouse (FR), Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Udine, University of Bergen (NO), Istanbul Commerce University (TR), New York University (US), Istanbul University (TR), AGH University of Krakow (PL), Université Savoie Mont Blanc (FR), University of Göttingen (DE), University of Oklahoma (US)
National Science Foundation, U.S. Department of Energy, Alexander von Humboldt-Stiftung, Canarie, Baden-Württemberg Stiftung, TRIUMF, CERN, UK Research and Innovation, Centres de Recerca de Catalunya, Türkiye Enerji, Nükleer ve Maden Araştırma Kurumu, Leverhulme Trust, Royal Society, European Commission, Deutsche Forschungsgemeinschaft, Agence Nationale de la Recherche, Ministry of Education, Culture, Sports, Science and Technology, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Danmarks Grundforskningsfond, Fundação de Amparo à Pesquisa do Estado de São Paulo, National Natural Science Foundation of China, Ministerstvo Školství, Mládeže a Tělovýchovy, Grantová Agentura České Republiky, Bundesministerium für Bildung und Forschung, Austrian Science Fund, Carl Tryggers Stiftelse för Vetenskaplig Forskning, Generalitat de Catalunya, Ministry of Science and Technology of the People's Republic of China, Nederlandse Organisatie voor Wetenschappelijk Onderzoek, Generalitat Valenciana, Bundesministerium für Wissenschaft, Forschung und Wirtschaft, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Knut och Alice Wallenbergs Stiftelse, Max-Planck-Gesellschaft, Vetenskapsrådet, Ministerstwo Edukacji i Nauki, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Centre National de la Recherche Scientifique, Ministerio de Ciencia e Innovación, Norges Forskningsråd, Centre National pour la Recherche Scientifique et Technique, Forskningsrådet om Hälsa, Arbetsliv och Välfärd, Istituto Nazionale di Fisica Nucleare, Narodowa Agencja Wymiany Akademickiej, Agencia Nacional de Investigación y Desarrollo, National Science and Technology Council, Ministero dell'Università e della Ricerca, Horizon 2020 Framework Programme, Natural Sciences and Engineering Research Council of Canada, Science and Technology Facilities Council, Japan Society for the Promotion of Science, Fundação para a Ciência e a Tecnologia, Agencia Nacional de Promoción Científica y Tecnológica, British Columbia Knowledge Development Fund, European Regional Development Fund, Agencia Estatal de Investigación, Institut National de Physique Nucléaire et de Physique des Particules, European Social Fund, H2020 European Research Council, H2020 Marie Skłodowska-Curie Actions, CHIST-ERA
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High-Energy Particle Collisions Research
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