Measurement of the J/ψ Polarization with Respect to the Event Plane in Pb-Pb Collisions at the LHC

ALICE Collaboration

doi:10.1103/PhysRevLett.131.042303

Measurement of the J/ψ Polarization with Respect to the Event Plane in Pb-Pb Collisions at the LHC

ALICE Collaboration

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

We study the polarization of inclusive J/ψ produced in Pb-Pb collisions at sNN=5.02 TeV at the LHC in the dimuon channel, via the measurement of the angular distribution of its decay products. We perform the study in the rapidity region 2.5<y<4, for three transverse momentum intervals (2<pT<4, 4<pT<6, 6<pT<10 GeV/c) and as a function of the centrality of the collision for 2<pT<6 GeV/c. For the first time, the polarization is measured with respect to the event plane of the collision, by considering the angle between the positive-charge decay muon in the J/ψ rest frame and the axis perpendicular to the event-plane vector in the laboratory system. A small transverse polarization is measured, with a significance reaching 3.9σ at low pT and for intermediate centrality values. The polarization could be connected with the behavior of the quark-gluon plasma, formed in Pb-Pb collisions, as a rotating fluid with large vorticity, as well as with the existence of a strong magnetic field in the early stage of its formation.

Original language	English
Article number	042303
Number of pages	13
Journal	Physical Review Letters
Volume	131
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.131.042303
Publication status	Published - 28 Jul 2023

Bibliographical note

Publisher Copyright:
© 2023 CERN. for the ALICE Collaboration.

Funding

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 centers 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 U.S. (NSF) and U.S. Department of Energy, Office of Nuclear Physics (DOE NP). In addition, individual groups or members have received support from Marie Skłodowska Curie, Strong 2020—Horizon 2020, European Research Council (Grants No. 824093, No. 896850, No. 950692), European Union; Academy of Finland (Center of Excellence in Quark Matter) (Grants No. 346327, No. 346328), Finland; Programa de Apoyos para la Superación del Personal Académico, UNAM, Mexico.

Funders	Funder number
General Secretariat for Research and Technology, Ministry of Education, Research and Religions
Helsinki Institute of Physics
Ministry of Communications and High Technologies
Ministry of Education, Science, Research and Sport
Ministry of Education, Youth and Sports of the Czech Republic, Czech Republic
Ministry of Science and Education and Croatian Science Foundation
NSRF
National Nuclear Research Center
National Science, Research and Innovation Fund
State Committee of Science and World Federation
University Grants Commission, Government of India
WUT ID-UB
A. Alikhanian Yerevan Institute of Physics
National Science Foundation
U.S. Department of Energy
Nuclear Physics Group
Natur og Univers, Det Frie Forskningsråd
VILLUM FONDEN
Ministry of Education and Science of Ukraine
Österreichische Nationalstiftung für Forschung, Technologie und Entwicklung
CERN
Türkiye Enerji, Nükleer ve Maden Araştırma Kurumu
Badan Riset dan Inovasi Nasional
Science and Technology Facilities Council
National Research Foundation
Department of Science and Technology, Ministry of Science and Technology, India
Council of Scientific and Industrial Research, India
University Grants Commission
Government of India, Department of Atomic Energy
Japan Society for the Promotion of Science
Ministry of Education, Culture, Sports, Science and Technology
Danmarks Grundforskningsfond
Fundação de Amparo à Pesquisa do Estado de São Paulo
National Natural Science Foundation of China
Österreichischen Akademie der Wissenschaften
Ministry of Education of the People's Republic of China
Bundesministerium für Bildung und Forschung
FWF Austrian Science Fund	M 2467-N36
Ministry of Science and Technology of the People's Republic of China
Consejo Nacional de Ciencia y Tecnología - Paraguay
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Korea Institute of Science and Technology Information
National Research Foundation of Korea
Instituto Nazionale di Fisica Nucleare
Knut och Alice Wallenbergs Stiftelse
National Science and Technology Development Agency Thailand
Narodowe Centrum Nauki
Suranaree University of Technology
Vetenskapsrådet
National Academy of Sciences of Ukraine
CNRS Centre National de la Recherche Scientifique
Financiadora de Estudos e Projetos
Universidade Federal do Rio Grande do Sul
Norges Forskningsråd
Ministry of Education and Science of Ukraine
Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
Ministry of Higher Education and Scientific Research
Universitatea din București
Fondo de Cooperación Internacional en Ciencia y Tecnología
GSI Helmholtzzentrum für Schwerionenforschung
Nemzeti Kutatási Fejlesztési és Innovációs Hivatal
Institut national de physique nucléaire et de physique des particules
Ontario Ministry of Research and Innovation
Thailand Science Research and Innovation
Institutul de Fizică Atomică
Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear

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10.1103/PhysRevLett.131.042303Licence: CC BY

PhysRevLett.131.042303Final published version, 14.8 MBLicence: CC BY

Cite this

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title = "Measurement of the J/ψ Polarization with Respect to the Event Plane in Pb-Pb Collisions at the LHC",

abstract = "We study the polarization of inclusive J/ψ produced in Pb-Pb collisions at sNN=5.02 TeV at the LHC in the dimuon channel, via the measurement of the angular distribution of its decay products. We perform the study in the rapidity region 2.5",

author = "\{ALICE Collaboration\} and S. Acharya and D. Adamov{\'a} and A. Adler and \{Aglieri Rinella\}, G. and M. Agnello and N. Agrawal and Z. Ahammed and S. Ahmad and Ahn, \{S. U.\} and I. Ahuja and A. Akindinov and M. Al-Turany and D. Aleksandrov and B. Alessandro and Alfanda, \{H. M.\} and \{Alfaro Molina\}, R. and B. Ali and Y. Ali and A. Alici and N. Alizadehvandchali and A. Alkin and J. Alme and G. Alocco and T. Alt and I. Altsybeev and Anaam, \{M. N.\} and C. Andrei and A. Andronic and V. Anguelov and F. Antinori and P. Antonioli and C. Anuj and N. Apadula and L. Aphecetche and P. Christakoglou and A. Grelli and B. Hofman and A. Isakov and Keijdener, \{D. L.D.\} and Kuijer, \{P. G.\} and Mohanty, \{A. P.\} and T. Peitzmann and S. Qiu and Snellings, \{R. J.M.\} and R. Spijkers and \{Van Doremalen\}, \{L. V.R.\} and \{Van Leeuwen\}, M. and \{Van Weelden\}, \{R. J.G.\} and L. Vermunt and M. Verweij and \{Correia Zanoli\}, Henrique and \{Pliatskas Stylianidis\}, Christos",

note = "Publisher Copyright: {\textcopyright} 2023 CERN. for the ALICE Collaboration.",

year = "2023",

month = jul,

day = "28",

doi = "10.1103/PhysRevLett.131.042303",

language = "English",

volume = "131",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

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AU - ALICE Collaboration

AU - Acharya, S.

AU - Adamová, D.

AU - Adler, A.

AU - Aglieri Rinella, G.

AU - Agnello, M.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahmad, S.

AU - Ahn, S. U.

AU - Ahuja, I.

AU - Akindinov, A.

AU - Al-Turany, M.

AU - Aleksandrov, D.

AU - Alessandro, B.

AU - Alfanda, H. M.

AU - Alfaro Molina, R.

AU - Ali, B.

AU - Ali, Y.

AU - Alici, A.

AU - Alizadehvandchali, N.

AU - Alkin, A.

AU - Alme, J.

AU - Alocco, G.

AU - Alt, T.

AU - Altsybeev, I.

AU - Anaam, M. N.

AU - Andrei, C.

AU - Andronic, A.

AU - Anguelov, V.

AU - Antinori, F.

AU - Antonioli, P.

AU - Anuj, C.

AU - Apadula, N.

AU - Aphecetche, L.

AU - Christakoglou, P.

AU - Grelli, A.

AU - Hofman, B.

AU - Isakov, A.

AU - Keijdener, D. L.D.

AU - Kuijer, P. G.

AU - Mohanty, A. P.

AU - Peitzmann, T.

AU - Qiu, S.

AU - Snellings, R. J.M.

AU - Spijkers, R.

AU - Van Doremalen, L. V.R.

AU - Van Leeuwen, M.

AU - Van Weelden, R. J.G.

AU - Vermunt, L.

AU - Verweij, M.

AU - Correia Zanoli, Henrique

AU - Pliatskas Stylianidis, Christos

PY - 2023/7/28

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AB - We study the polarization of inclusive J/ψ produced in Pb-Pb collisions at sNN=5.02 TeV at the LHC in the dimuon channel, via the measurement of the angular distribution of its decay products. We perform the study in the rapidity region 2.5

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DO - 10.1103/PhysRevLett.131.042303

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AN - SCOPUS:85167745487

SN - 0031-9007

VL - 131

JO - Physical Review Letters

JF - Physical Review Letters

IS - 4

M1 - 042303

ER -

Measurement of the J/ψ Polarization with Respect to the Event Plane in Pb-Pb Collisions at the LHC

Abstract

Bibliographical note

Funding

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