Abstract
The transverse momentum (pT) and centrality dependence of the nuclear modification factor RAA of prompt and non-prompt J/ψ, the latter originating from the weak decays of beauty hadrons, have been measured by the ALICE collaboration in Pb–Pb collisions at \( \sqrt{s_{\textrm{NN}}} \) = 5.02 TeV. The measurements are carried out through the e+e− decay channel at midrapidity (|y| < 0.9) in the transverse momentum region 1.5 < pT < 10 GeV/c. Both prompt and non-prompt J/ψ measurements indicate a significant suppression for pT > 5 GeV/c, which becomes stronger with increasing collision centrality. The results are consistent with similar LHC measurements in the overlapping pT intervals, and cover the kinematic region down to pT = 1.5 GeV/c at midrapidity, not accessible by other LHC experiments. The suppression of prompt J/ψ in central and semicentral collisions exhibits a decreasing trend towards lower transverse momentum, described within uncertainties by models implementing J/ψ production from recombination of c and \( \overline{\textrm{c}} \) quarks produced independently in different partonic scatterings. At high transverse momentum, transport models including quarkonium dissociation are able to describe the suppression for prompt J/ψ. For non-prompt J/ψ, the suppression predicted by models including both collisional and radiative processes for the computation of the beauty-quark energy loss inside the quark-gluon plasma is consistent with measurements within uncertainties.
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Acknowledgments
The ALICE Collaboration would like to thank all its engineers and technicians for their invaluable contributions to the construction of the experiment and the CERN accelerator teams for the outstanding performance of the LHC complex. The ALICE Collaboration gratefully acknowledges the resources and support provided by all Grid centres and the Worldwide LHC Computing Grid (WLCG) collaboration. The ALICE Collaboration acknowledges the following funding agencies for their support in building and running the ALICE detector: A. I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation (ANSL), State Committee of Science and World Federation of Scientists (WFS), Armenia; Austrian Academy of Sciences, Austrian Science Fund (FWF): [M 2467-N36] and Nationalstiftung für Forschung, Technologie und Entwicklung, Austria; Ministry of Communications and High Technologies, National Nuclear Research Center, Azerbaijan; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Financiadora de Estudos e Projetos (Finep), Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) and Universidade Federal do Rio Grande do Sul (UFRGS), Brazil; Bulgarian Ministry of Education and Science, within the National Roadmap for Research Infrastructures 2020-2027 (object CERN), Bulgaria; Ministry of Education of China (MOEC) , Ministry of Science & Technology of China (MSTC) and National Natural Science Foundation of China (NSFC), China; Ministry of Science and Education and Croatian Science Foundation, Croatia; Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Cubaenergía, Cuba; Ministry of Education, Youth and Sports of the Czech Republic, Czech Republic; The Danish Council for Independent Research | Natural Sciences, the VILLUM FONDEN and Danish National Research Foundation (DNRF), Denmark; Helsinki Institute of Physics (HIP), Finland; Commissariat à l’Energie Atomique (CEA) and Institut National de Physique Nucléaire et de Physique des Particules (IN2P3) and Centre National de la Recherche Scientifique (CNRS), France; Bundesministerium für Bildung und Forschung (BMBF) and GSI Helmholtzzentrum für Schwerionenforschung GmbH, Germany; General Secretariat for Research and Technology, Ministry of Education, Research and Religions, Greece; National Research, Development and Innovation Office, Hungary; Department of Atomic Energy Government of India (DAE), Department of Science and Technology, Government of India (DST), University Grants Commission, Government of India (UGC) and Council of Scientific and Industrial Research (CSIR), India; National Research and Innovation Agency - BRIN, Indonesia; Istituto Nazionale di Fisica Nucleare (INFN), Italy; Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) and Japan Society for the Promotion of Science (JSPS) KAKENHI, Japan; Consejo Nacional de Ciencia (CONACYT) y Tecnología, through Fondo de Cooperación Internacional en Ciencia y Tecnología (FONCICYT) and Dirección General de Asuntos del Personal Academico (DGAPA), Mexico; Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands; The Research Council of Norway, Norway; Commission on Science and Technology for Sustainable Development in the South (COMSATS), Pakistan; Pontificia Universidad Católica del Perú, Peru; Ministry of Education and Science, National Science Centre and WUT ID-UB, Poland; Korea Institute of Science and Technology Information and National Research Foundation of Korea (NRF), Republic of Korea; Ministry of Education and Scientific Research, Institute of Atomic Physics, Ministry of Research and Innovation and Institute of Atomic Physics and University Politehnica of Bucharest, Romania; Ministry of Education, Science, Research and Sport of the Slovak Republic, Slovakia; National Research Foundation of South Africa, South Africa; Swedish Research Council (VR) and Knut & Alice Wallenberg Foundation (KAW), Sweden; European Organization for Nuclear Research, Switzerland; Suranaree University of Technology (SUT), National Science and Technology Development Agency (NSTDA), Thailand Science Research and Innovation (TSRI) and National Science, Research and Innovation Fund (NSRF), Thailand; Turkish Energy, Nuclear and Mineral Research Agency (TENMAK), Turkey; National Academy of Sciences of Ukraine, Ukraine; Science and Technology Facilities Council (STFC), United Kingdom; National Science Foundation of the United States of America (NSF) and United States Department of Energy, Office of Nuclear Physics (DOE NP), United States of America. In addition, individual groups or members have received support from: European Research Council, Strong 2020 — Horizon 2020 (grant nos. 950692, 824093), European Union; Academy of Finland (Center of Excellence in Quark Matter) (grant nos. 346327, 346328), Finland.
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A. Akindinov, D. Aleksandrov, S. Belokurova, Y. Berdnikov, D. Blau, A. Bogdanov, A. Borissov, D. Budnikov, N. Burmasov, U. Dmitrieva, S. Evdokimov, G. Feofilov, D. Finogeev, S. Fokin, A. Furs, P. Gordeev, V. Grigoriev, R. Ilkaev, M. Ippolitov, V. Ivanov, V. Kaplin, O. Karavichev, T. Karavicheva, E. Karpechev, A. Khanzadeev, Y. Kharlov, S. Kiselev, N. Kondratyeva, E. Kondratyuk, V. Kovalenko, E. Kryshen, A. Kurepin, A. B. Kurepin, A. Kuryakin, V. Kuskov, M. Malaev, V. Manko, K. Mikhaylov, I. Morozov, E. Nekrasova, S. Nikolaev, S. Nikulin, V. Nikulin, A. Nyanin, V. A. Okorokov, D. Peresunko, Y. Pestov, V. Petrov, B. Polichtchouk, I. Pshenichnov, A. Riabov, V. Riabov, R. Rogalev, E. Ryabinkin, Y. Ryabov, S. Sadovsky, D. Serebryakov, A. Shangaraev, S. Shirinkin, Y. Sibiriak, M. Sukhanov, R. Sultanov, A. Tikhonov, N. Topilskaya, A. Tumkin, A. Vasiliev, V. Vechernin, A. Vinogradov, K. Voloshin, N. Vozniuk, A. Zarochentsev, N. Zaviyalov, M. Zhalov and V. Zherebchevskii are affiliated with an institute covered by a cooperation agreement with CERN
B. Batyunya, C. Ceballos Sanchez, R. A. Diaz, S. Grigoryan, A. Kondratyev, L. Malinina, K. Mikhaylov, P. Nomokonov, V. Pozdniakov, E. Rogochaya and A. Vodopyanov are affiliated with an international laboratory covered by a cooperation agreement with CERN
L. Malinina was also at an institution covered by a cooperation agreement with CERN
Deceased (L. Malinina)
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The ALICE collaboration., Acharya, S., Adamová, D. et al. Prompt and non-prompt J/ψ production at midrapidity in Pb–Pb collisions at \( \sqrt{s_{\textrm{NN}}} \) = 5.02 TeV. J. High Energ. Phys. 2024, 66 (2024). https://doi.org/10.1007/JHEP02(2024)066
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DOI: https://doi.org/10.1007/JHEP02(2024)066