Measurement of the J/ψ Polarization with Respect to the Event Plane in Pb-Pb Collisions at the LHC
Affiliations
- 1 Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
- 2 Variable Energy Cyclotron Centre, Homi Bhabha National Institute, Kolkata, India.
- 3 Nuclear Physics Institute of the Czech Academy of Sciences, Husinec-Řež, Czech Republic.
- 4 Johann-Wolfgang-Goethe Universität Frankfurt Institut für Informatik, Fachbereich Informatik und Mathematik, Frankfurt, Germany.
- 5 European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 6 Dipartimento DISAT del Politecnico and Sezione INFN, Turin, Italy.
- 7 INFN, Sezione di Bologna, Bologna, Italy.
- 8 Department of Physics, Aligarh Muslim University, Aligarh, India.
- 9 Korea Institute of Science and Technology Information, Daejeon, Republic of Korea.
- 10 Faculty of Science, Pavol Jozef Šafárik University, Košice, Slovak Republic.
- 11 Affiliated with an institute covered by a cooperation agreement with CERN.
- 12 Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany.
- 13 INFN, Sezione di Torino, Turin, Italy.
- 14 Central China Normal University, Wuhan, China.
- 15 Instituto de Física, Universidad Nacional Autónoma de México, Mexico City, Mexico.
- 16 COMSATS University Islamabad, Islamabad, Pakistan.
- 17 Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Bologna, Italy.
- 18 University of Houston, Houston, Texas, USA.
- 19 Department of Physics and Technology, University of Bergen, Bergen, Norway.
- 20 INFN, Sezione di Cagliari, Cagliari, Italy.
- 21 Institut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany.
- 22 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania.
- 23 Westfälische Wilhelms-Universität Münster, Institut für Kernphysik, Munster, Germany.
- 24 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
- 25 INFN, Sezione di Padova, Padova, Italy.
- 26 Lawrence Berkeley National Laboratory, Berkeley, California, USA.
- 27 SUBATECH, IMT Atlantique, Nantes Université, CNRS-IN2P3, Nantes, France.
- 28 Department of Physics, University of Oslo, Oslo, Norway.
- 29 Yale University, New Haven, Connecticut, USA.
- 30 Laboratoire de Physique des 2 Infinis, Irène Joliot-Curie, Orsay, France.
- 31 INFN, Sezione di Catania, Catania, Italy.
- 32 Gangneung-Wonju National University, Gangneung, Republic of Korea.
- 33 Indian Institute of Technology Indore, Indore, India.
- 34 Physics Department, University of Jammu, Jammu, India.
- 35 Départment de Physique Nucléaire (DPhN), Université Paris-Saclay Centre d'Etudes de Saclay (CEA), IRFU, Saclay, France.
- 36 AGH University of Science and Technology, Cracow, Poland.
- 37 Bose Institute, Department of Physics and Centre for Astroparticle Physics and Space Science (CAPSS), Kolkata, India.
- 38 Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Catania, Italy.
- 39 Physik Department, Technische Universität München, Munich, Germany.
- 40 Department of Physics, School of Science, National and Kapodistrian University of Athens, Athens, Greece.
- 41 Wigner Research Centre for Physics, Budapest, Hungary.
- 42 Nuclear Physics Group, STFC Daresbury Laboratory, Daresbury, United Kingdom.
- 43 Universidade de São Paulo (USP), São Paulo, Brazil.
- 44 University of Liverpool, Liverpool, United Kingdom.
- 45 Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Padova, Italy.
- 46 Lund University Department of Physics, Division of Particle Physics, Lund, Sweden.
- 47 Affiliated with an international laboratory covered by a cooperation agreement with CERN.
- 48 Indian Institute of Technology Bombay (IIT), Mumbai, India.
- 49 Sección Física, Departamento de Ciencias, Pontificia Universidad Católica del Perú, Lima, Peru.
- 50 Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark.
- 51 Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France.
- 52 Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Mexico City, Mexico.
- 53 Dipartimento di Fisica dell'Università and Sezione INFN, Turin, Italy.
- 54 Institute of Space Science (ISS), Bucharest, Romania.
- 55 Department of Physics, Gauhati University, Guwahati, India.
- 56 INFN, Laboratori Nazionali di Frascati, Frascati, Italy.
- 57 Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic.
- 58 The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland.
- 59 The University of Texas at Austin, Austin, Texas, USA.
- 60 Frankfurt Institute for Advanced Studies, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany.
- 61 Dipartimento di Fisica, Università di Pavia, Pavia, Italy.
- 62 INFN, Sezione di Pavia, Pavia, Italy.
- 63 Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA.
- 64 Dipartimento di Fisica dell'Università and Sezione INFN, Cagliari, Italy.
- 65 Inha University, Incheon, Republic of Korea.
- 66 Università di Brescia, Brescia, Italy.
- 67 Dipartimento Interateneo di Fisica "M. Merlin" and Sezione INFN, Bari, Italy.
- 68 Politecnico di Bari and Sezione INFN, Bari, Italy.
- 69 Stefan Meyer Institut für Subatomare Physik (SMI), Vienna, Austria.
- 70 iThemba LABS, National Research Foundation, Somerset West, South Africa.
- 71 University of the Witwatersrand, Johannesburg, South Africa.
- 72 University of Kansas, Lawrence, Kansas, USA.
- 73 Universidad Autónoma de Sinaloa, Culiacán, Mexico.
- 74 High Energy Physics Group, Universidad Autónoma de Puebla, Puebla, Mexico.
- 75 Dipartimento di Fisica dell'Università and Sezione INFN, Trieste, Italy.
- 76 University Politehnica of Bucharest, Bucharest, Romania.
- 77 CNRS/IN2P3, Institut de Physique des 2 Infinis de Lyon, Université de Lyon, Lyon, France.
- 78 Saha Institute of Nuclear Physics, Homi Bhabha National Institute, Kolkata, India.
- 79 Universidade Estadual de Campinas (UNICAMP), Campinas, Brazil.
- 80 Nikhef, National Institute for Subatomic Physics, Amsterdam, Netherlands.
- 81 University of Tsukuba, Tsukuba, Japan.
- 82 INFN, Sezione di Bari, Bari, Italy.
- 83 School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom.
- 84 Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS-IN2P3, Grenoble, France.
- 85 Università del Piemonte Orientale, Vercelli, Italy.
- 86 Universidade Federal do ABC, Santo Andre, Brazil.
- 87 National Institute of Science Education and Research, Homi Bhabha National Institute, Jatni, India.
- 88 Dipartimento di Fisica "E.R. Caianiello" dell'Università and Gruppo Collegato INFN, Salerno, Italy.
- 89 Warsaw University of Technology, Warsaw, Poland.
- 90 Department of Physics, University of California, Berkeley, California, USA.
- 91 Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Havana, Cuba.
- 92 University of Cape Town, Cape Town, South Africa.
- 93 Physics Department, Panjab University, Chandigarh, India.
- 94 Technical University of Košice, Košice, Slovak Republic.
- 95 Comenius University Bratislava, Faculty of Mathematics, Physics and Informatics, Bratislava, Slovak Republic.
- 96 Physics Department, Faculty of Science, University of Zagreb, Zagreb, Croatia.
- 97 INFN, Sezione di Trieste, Trieste, Italy.
- 98 Chicago State University, Chicago, Illinois, USA.
- 99 National Nuclear Research Center, Baku, Azerbaijan.
- 100 Instituto de Física, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil.
- 101 University of Tennessee, Knoxville, Tennessee, USA.
- 102 Nagasaki Institute of Applied Science, Nagasaki, Japan.
- 103 Wayne State University, Detroit, Michigan, USA.
- 104 Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, Split, Croatia.
- 105 Institute for Gravitational and Subatomic Physics (GRASP), Utrecht University/Nikhef, Utrecht, Netherlands.
- 106 A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation, Yerevan, Armenia.
- 107 University of Tokyo, Tokyo, Japan.
- 108 Yonsei University, Seoul, Republic of Korea.
- 109 Helmholtz-Institut für Strahlen- und Kernphysik, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, Germany.
- 110 Faculty of Engineering and Science, Western Norway University of Applied Sciences, Bergen, Norway.
- 111 Centro de Investigación y de Estudios Avanzados (CINVESTAV), Mexico City and Mérida, Mexico.
- 112 Creighton University, Omaha, Nebraska, USA.
- 113 University of Jyväskylä, Jyväskylä, Finland.
- 114 Ohio State University, Columbus, Ohio, USA.
- 115 Suranaree University of Technology, Nakhon Ratchasima, Thailand.
- 116 Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic.
- 117 KTO Karatay University, Konya, Turkey.
- 118 Zentrum für Technologie und Transfer (ZTT), Worms, Germany.
- 119 Department of Physics, Pusan National University, Pusan, Republic of Korea.
- 120 Jeonbuk National University, Jeonju, Republic of Korea.
- 121 Department of Physics, Sejong University, Seoul, Republic of Korea.
- 122 California Polytechnic State University, San Luis Obispo, California, USA.
- 123 National Centre for Nuclear Research, Warsaw, Poland.
- 124 University of South-Eastern Norway, Kongsberg, Norway.
- 125 China Institute of Atomic Energy, Beijing, China.
- 126 University of Science and Technology of China, Hefei, China.
- 127 Fudan University, Shanghai, China.
- 128 Dipartimento di Scienze MIFT, Università di Messina, Messina, Italy.
- 129 Università degli Studi di Foggia, Foggia, Italy.
- 130 Helsinki Institute of Physics (HIP), Helsinki, Finland.
- 131 Chungbuk National University, Cheongju, Republic of Korea.
- 132 Physics Program and International Institute for Sustainability with Knotted Chiral Meta Matter (SKCM2), Hiroshima University, Hiroshima, Japan.
- 133 Physics Department, University of Rajasthan, Jaipur, India.
- 134 Institute of Physics, Homi Bhabha National Institute, Bhubaneswar, India.
- 135 Physikalisches Institut, Eberhard-Karls-Universität Tübingen, Tubingen, Germany.
- 136 Nara Women's University (NWU), Nara, Japan.
- 137 Faculty of Physics, Sofia University, Sofia, Bulgaria.
- 138 National Research and Innovation Agency - BRIN, Jakarta, Indonesia.
- 139 Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine, Kiev, Ukraine.
- 140 Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic.
- PMID: 37566833
- 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
Authors
Affiliations
- 1 Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
- 2 Variable Energy Cyclotron Centre, Homi Bhabha National Institute, Kolkata, India.
- 3 Nuclear Physics Institute of the Czech Academy of Sciences, Husinec-Řež, Czech Republic.
- 4 Johann-Wolfgang-Goethe Universität Frankfurt Institut für Informatik, Fachbereich Informatik und Mathematik, Frankfurt, Germany.
- 5 European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 6 Dipartimento DISAT del Politecnico and Sezione INFN, Turin, Italy.
- 7 INFN, Sezione di Bologna, Bologna, Italy.
- 8 Department of Physics, Aligarh Muslim University, Aligarh, India.
- 9 Korea Institute of Science and Technology Information, Daejeon, Republic of Korea.
- 10 Faculty of Science, Pavol Jozef Šafárik University, Košice, Slovak Republic.
- 11 Affiliated with an institute covered by a cooperation agreement with CERN.
- 12 Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany.
- 13 INFN, Sezione di Torino, Turin, Italy.
- 14 Central China Normal University, Wuhan, China.
- 15 Instituto de Física, Universidad Nacional Autónoma de México, Mexico City, Mexico.
- 16 COMSATS University Islamabad, Islamabad, Pakistan.
- 17 Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Bologna, Italy.
- 18 University of Houston, Houston, Texas, USA.
- 19 Department of Physics and Technology, University of Bergen, Bergen, Norway.
- 20 INFN, Sezione di Cagliari, Cagliari, Italy.
- 21 Institut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany.
- 22 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania.
- 23 Westfälische Wilhelms-Universität Münster, Institut für Kernphysik, Munster, Germany.
- 24 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
- 25 INFN, Sezione di Padova, Padova, Italy.
- 26 Lawrence Berkeley National Laboratory, Berkeley, California, USA.
- 27 SUBATECH, IMT Atlantique, Nantes Université, CNRS-IN2P3, Nantes, France.
- 28 Department of Physics, University of Oslo, Oslo, Norway.
- 29 Yale University, New Haven, Connecticut, USA.
- 30 Laboratoire de Physique des 2 Infinis, Irène Joliot-Curie, Orsay, France.
- 31 INFN, Sezione di Catania, Catania, Italy.
- 32 Gangneung-Wonju National University, Gangneung, Republic of Korea.
- 33 Indian Institute of Technology Indore, Indore, India.
- 34 Physics Department, University of Jammu, Jammu, India.
- 35 Départment de Physique Nucléaire (DPhN), Université Paris-Saclay Centre d'Etudes de Saclay (CEA), IRFU, Saclay, France.
- 36 AGH University of Science and Technology, Cracow, Poland.
- 37 Bose Institute, Department of Physics and Centre for Astroparticle Physics and Space Science (CAPSS), Kolkata, India.
- 38 Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Catania, Italy.
- 39 Physik Department, Technische Universität München, Munich, Germany.
- 40 Department of Physics, School of Science, National and Kapodistrian University of Athens, Athens, Greece.
- 41 Wigner Research Centre for Physics, Budapest, Hungary.
- 42 Nuclear Physics Group, STFC Daresbury Laboratory, Daresbury, United Kingdom.
- 43 Universidade de São Paulo (USP), São Paulo, Brazil.
- 44 University of Liverpool, Liverpool, United Kingdom.
- 45 Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Padova, Italy.
- 46 Lund University Department of Physics, Division of Particle Physics, Lund, Sweden.
- 47 Affiliated with an international laboratory covered by a cooperation agreement with CERN.
- 48 Indian Institute of Technology Bombay (IIT), Mumbai, India.
- 49 Sección Física, Departamento de Ciencias, Pontificia Universidad Católica del Perú, Lima, Peru.
- 50 Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark.
- 51 Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France.
- 52 Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Mexico City, Mexico.
- 53 Dipartimento di Fisica dell'Università and Sezione INFN, Turin, Italy.
- 54 Institute of Space Science (ISS), Bucharest, Romania.
- 55 Department of Physics, Gauhati University, Guwahati, India.
- 56 INFN, Laboratori Nazionali di Frascati, Frascati, Italy.
- 57 Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic.
- 58 The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland.
- 59 The University of Texas at Austin, Austin, Texas, USA.
- 60 Frankfurt Institute for Advanced Studies, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany.
- 61 Dipartimento di Fisica, Università di Pavia, Pavia, Italy.
- 62 INFN, Sezione di Pavia, Pavia, Italy.
- 63 Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA.
- 64 Dipartimento di Fisica dell'Università and Sezione INFN, Cagliari, Italy.
- 65 Inha University, Incheon, Republic of Korea.
- 66 Università di Brescia, Brescia, Italy.
- 67 Dipartimento Interateneo di Fisica "M. Merlin" and Sezione INFN, Bari, Italy.
- 68 Politecnico di Bari and Sezione INFN, Bari, Italy.
- 69 Stefan Meyer Institut für Subatomare Physik (SMI), Vienna, Austria.
- 70 iThemba LABS, National Research Foundation, Somerset West, South Africa.
- 71 University of the Witwatersrand, Johannesburg, South Africa.
- 72 University of Kansas, Lawrence, Kansas, USA.
- 73 Universidad Autónoma de Sinaloa, Culiacán, Mexico.
- 74 High Energy Physics Group, Universidad Autónoma de Puebla, Puebla, Mexico.
- 75 Dipartimento di Fisica dell'Università and Sezione INFN, Trieste, Italy.
- 76 University Politehnica of Bucharest, Bucharest, Romania.
- 77 CNRS/IN2P3, Institut de Physique des 2 Infinis de Lyon, Université de Lyon, Lyon, France.
- 78 Saha Institute of Nuclear Physics, Homi Bhabha National Institute, Kolkata, India.
- 79 Universidade Estadual de Campinas (UNICAMP), Campinas, Brazil.
- 80 Nikhef, National Institute for Subatomic Physics, Amsterdam, Netherlands.
- 81 University of Tsukuba, Tsukuba, Japan.
- 82 INFN, Sezione di Bari, Bari, Italy.
- 83 School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom.
- 84 Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS-IN2P3, Grenoble, France.
- 85 Università del Piemonte Orientale, Vercelli, Italy.
- 86 Universidade Federal do ABC, Santo Andre, Brazil.
- 87 National Institute of Science Education and Research, Homi Bhabha National Institute, Jatni, India.
- 88 Dipartimento di Fisica "E.R. Caianiello" dell'Università and Gruppo Collegato INFN, Salerno, Italy.
- 89 Warsaw University of Technology, Warsaw, Poland.
- 90 Department of Physics, University of California, Berkeley, California, USA.
- 91 Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Havana, Cuba.
- 92 University of Cape Town, Cape Town, South Africa.
- 93 Physics Department, Panjab University, Chandigarh, India.
- 94 Technical University of Košice, Košice, Slovak Republic.
- 95 Comenius University Bratislava, Faculty of Mathematics, Physics and Informatics, Bratislava, Slovak Republic.
- 96 Physics Department, Faculty of Science, University of Zagreb, Zagreb, Croatia.
- 97 INFN, Sezione di Trieste, Trieste, Italy.
- 98 Chicago State University, Chicago, Illinois, USA.
- 99 National Nuclear Research Center, Baku, Azerbaijan.
- 100 Instituto de Física, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil.
- 101 University of Tennessee, Knoxville, Tennessee, USA.
- 102 Nagasaki Institute of Applied Science, Nagasaki, Japan.
- 103 Wayne State University, Detroit, Michigan, USA.
- 104 Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, Split, Croatia.
- 105 Institute for Gravitational and Subatomic Physics (GRASP), Utrecht University/Nikhef, Utrecht, Netherlands.
- 106 A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation, Yerevan, Armenia.
- 107 University of Tokyo, Tokyo, Japan.
- 108 Yonsei University, Seoul, Republic of Korea.
- 109 Helmholtz-Institut für Strahlen- und Kernphysik, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, Germany.
- 110 Faculty of Engineering and Science, Western Norway University of Applied Sciences, Bergen, Norway.
- 111 Centro de Investigación y de Estudios Avanzados (CINVESTAV), Mexico City and Mérida, Mexico.
- 112 Creighton University, Omaha, Nebraska, USA.
- 113 University of Jyväskylä, Jyväskylä, Finland.
- 114 Ohio State University, Columbus, Ohio, USA.
- 115 Suranaree University of Technology, Nakhon Ratchasima, Thailand.
- 116 Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic.
- 117 KTO Karatay University, Konya, Turkey.
- 118 Zentrum für Technologie und Transfer (ZTT), Worms, Germany.
- 119 Department of Physics, Pusan National University, Pusan, Republic of Korea.
- 120 Jeonbuk National University, Jeonju, Republic of Korea.
- 121 Department of Physics, Sejong University, Seoul, Republic of Korea.
- 122 California Polytechnic State University, San Luis Obispo, California, USA.
- 123 National Centre for Nuclear Research, Warsaw, Poland.
- 124 University of South-Eastern Norway, Kongsberg, Norway.
- 125 China Institute of Atomic Energy, Beijing, China.
- 126 University of Science and Technology of China, Hefei, China.
- 127 Fudan University, Shanghai, China.
- 128 Dipartimento di Scienze MIFT, Università di Messina, Messina, Italy.
- 129 Università degli Studi di Foggia, Foggia, Italy.
- 130 Helsinki Institute of Physics (HIP), Helsinki, Finland.
- 131 Chungbuk National University, Cheongju, Republic of Korea.
- 132 Physics Program and International Institute for Sustainability with Knotted Chiral Meta Matter (SKCM2), Hiroshima University, Hiroshima, Japan.
- 133 Physics Department, University of Rajasthan, Jaipur, India.
- 134 Institute of Physics, Homi Bhabha National Institute, Bhubaneswar, India.
- 135 Physikalisches Institut, Eberhard-Karls-Universität Tübingen, Tubingen, Germany.
- 136 Nara Women's University (NWU), Nara, Japan.
- 137 Faculty of Physics, Sofia University, Sofia, Bulgaria.
- 138 National Research and Innovation Agency - BRIN, Jakarta, Indonesia.
- 139 Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine, Kiev, Ukraine.
- 140 Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic.
- PMID: 37566833
- DOI: 10.1103/PhysRevLett.131.042303
Abstract
We study the polarization of inclusive J/ψ produced in Pb-Pb collisions at sqrt[s_{NN}]=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<p_{T}<4, 4<p_{T}<6, 6<p_{T}<10 GeV/c) and as a function of the centrality of the collision for 2<p_{T}<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 p_{T} 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.
LinkOut - more resources
Full Text Sources