Polarization of Λ and Λ[over ¯] Hyperons along the Beam Direction in Pb-Pb Collisions at sqrt[s]_{NN}=5.02 TeV

. 2022 Apr 29 ; 128 (17) : 172005.

Status PubMed-not-MEDLINE Jazyk angličtina Země Spojené státy americké Médium print

Typ dokumentu časopisecké články

Perzistentní odkaz   https://www.medvik.cz/link/pmid35570422

The polarization of the Λ and Λ[over ¯] hyperons along the beam (z) direction, P_{z}, has been measured in Pb-Pb collisions at sqrt[s_{NN}]=5.02 TeV recorded with ALICE at the Large Hadron Collider (LHC). The main contribution to P_{z} comes from elliptic flow-induced vorticity and can be characterized by the second Fourier sine coefficient P_{z,s2}=⟨P_{z}sin(2φ-2Ψ_{2})⟩, where φ is the hyperon azimuthal emission angle and Ψ_{2} is the elliptic flow plane angle. We report the measurement of P_{z,s2} for different collision centralities and in the 30%-50% centrality interval as a function of the hyperon transverse momentum and rapidity. The P_{z,s2} is positive similarly as measured by the STAR Collaboration in Au-Au collisions at sqrt[s_{NN}]=200 GeV, with somewhat smaller amplitude in the semicentral collisions. This is the first experimental evidence of a nonzero hyperon P_{z} in Pb-Pb collisions at the LHC. The comparison of the measured P_{z,s2} with the hydrodynamic model calculations shows sensitivity to the competing contributions from thermal and the recently found shear-induced vorticity, as well as to whether the polarization is acquired at the quark-gluon plasma or the hadronic phase.

A 1 Alikhanyan National Science Laboratory Foundation Yerevan Armenia

AGH University of Science and Technology Cracow Poland

Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine

Bose Institute Department of Physics Kolkata India

Budker Institute for Nuclear Physics Novosibirsk Russia

California Polytechnic State University San Luis Obispo California USA

Central China Normal University Wuhan China

Centre for Astroparticle Physics and Space Science Kolkata India

Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear Havana Cuba

Centro de Investigación y de Estudios Avanzados Mexico City and Mérida Mexico

Chicago State University Chicago Illinois USA

China Institute of Atomic Energy Beijing China

Chungbuk National University Cheongju Republic of Korea

Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia

COMSATS University Islamabad Islamabad Pakistan

Creighton University Nebraska USA

Department of Physics Aligarh Muslim University Aligarh India

Department of Physics and Technology University of Bergen Bergen Norway

Department of Physics Pusan National University Pusan Republic of Korea

Department of Physics Sejong University Seoul Republic of Korea

Department of Physics University of California Berkeley California USA

Department of Physics University of Oslo Oslo Norway

Dipartimento di Fisica dell'Università Cagliari Italy

Dipartimento di Fisica dell'Università La Sapienza Rome Italy

Dipartimento di Fisica dell'Università Trieste Italy

Dipartimento di Fisica dell'Università Turin Italy

Dipartimento di Fisica e Astronomia dell'Università Bologna Italy

Dipartimento di Fisica e Astronomia dell'Università Catania Italy

Dipartimento di Fisica e Astronomia dell'Università Padova Italy

Dipartimento di Fisica e Nucleare e Teorica Università di Pavia Pavia Italy

Dipartimento di Fisica E R Caianiello dell'Università Salerno Italy

Dipartimento di Scienze e Innovazione Tecnologica dell'Università del Piemonte Orientale and INFN Sezione di Torino Alessandria Italy

Dipartimento di Scienze MIFT Università di Messina Messina Italy

Dipartimento DISAT del Politecnico and Sezione INFN Turin Italy

Dipartimento Interateneo di Fisica M Merlin Bari Italy

European Organization for Nuclear Research Geneva Switzerland

Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture University of Split Split Croatia

Faculty of Engineering and Science Western Norway University of Applied Sciences Bergen Norway

Faculty of Nuclear Sciences and Physical Engineering Czech Technical University Prague Prague Czech Republic

Faculty of Science P J Šafárik University Košice Slovakia

Frankfurt Institute for Advanced Studies Johann Wolfgang Goethe Universität Frankfurt Frankfurt Germany

Fudan University China

Gangneung Wonju National University Gangneung Republic of Korea

Gauhati University Department of Physics Guwahati India

Gruppo Collegato INFN Salerno Italy

Helmholtz Institut für Strahlen und Kernphysik Rheinische Friedrich Wilhelms Universität Bonn Bonn Germany

Helsinki Institute of Physics Helsinki Finland

High Energy Physics Group Universidad Autónoma de Puebla Puebla Mexico

Hiroshima University Hiroshima Japan

Hochschule Worms Zentrum für Technologietransfer und Telekommunikation Worms Germany

Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest Romania

Indian Institute of Technology Bombay Mumbai India

Indian Institute of Technology Indore Indore India

Indonesian Institute of Sciences Jakarta Indonesia

INFN Laboratori Nazionali di Frascati Frascati Italy

INFN Sezione di Bari Bari Italy

INFN Sezione di Bologna Bologna Italy

INFN Sezione di Cagliari Cagliari Italy

INFN Sezione di Catania Catania Italy

INFN Sezione di Padova Padova Italy

INFN Sezione di Pavia Pavia Italy

INFN Sezione di Roma Rome Italy

INFN Sezione di Torino Turin Italy

INFN Sezione di Trieste Trieste Italy

Inha University Incheon Republic of Korea

Institut für Kernphysik Johann Wolfgang Goethe Universität Frankfurt Frankfurt Germany

Institute for Gravitational and Subatomic Physics Utrecht University Nikhef Utrecht Netherlands

Institute for Nuclear Research Academy of Sciences Moscow Russia

Institute of Experimental Physics Slovak Academy of Sciences Košice Slovakia

Institute of Physics Homi Bhabha National Institute Bhubaneswar India

Institute of Physics of the Czech Academy of Sciences Prague Czech Republic

Institute of Space Science Bucharest Romania

Instituto de Ciencias Nucleares Universidad Nacional Autónoma de México Mexico City Mexico

Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico

Instituto de Física Universidade Federal do Rio Grande do Sul Porto Alegre Brazil

iThemba LABS National Research Foundation Somerset West South Africa

Jeonbuk National University Jeonju Republic of Korea

Johann Wolfgang Goethe Universität Frankfurt Institut für Informatik Fachbereich Informatik und Mathematik Frankfurt Germany

Joint Institute for Nuclear Research Dubna Russia

Korea Institute of Science and Technology Information Daejeon Republic of Korea

KTO Karatay University Konya Turkey

Laboratoire de Physique des 2 Infinis Irène Joliot Curie Orsay France

Laboratoire de Physique Subatomique et de Cosmologie Université Grenoble Alpes CNRS IN2P3 Grenoble France

Lawrence Berkeley National Laboratory Berkeley California USA

Lund University Department of Physics Division of Particle Physics Division of Particle Physics Lund Sweden

Moscow Institute for Physics and Technology Moscow Russia

Nagasaki Institute of Applied Science Nagasaki Japan

Nara Women's University Nara Japan

National and Kapodistrian University of Athens School of Science Department of Physics Athens Greece

National Centre for Nuclear Research Warsaw Poland

National Institute of Science Education and Research Homi Bhabha National Institute Jatni India

National Nuclear Research Center Baku Azerbaijan

National Research Centre Kurchatov Institute Moscow Russia

Niels Bohr Institute University of Copenhagen Copenhagen Denmark

Nikhef National institute for subatomic physics Amsterdam Netherlands

NRC «Kurchatov» Institute ITEP Moscow Russia

NRC Kurchatov Institute IHEP Protvino Russia

NRNU Moscow Engineering Physics Institute Moscow Russia

Nuclear Physics Group STFC Daresbury Laboratory Daresbury United Kingdom

Nuclear Physics Institute of the Czech Academy of Sciences Řež u Prahy Czech Republic

Oak Ridge National Laboratory Oak Ridge Tennessee USA

Ohio State University Columbus Ohio USA

Petersburg Nuclear Physics Institute Gatchina Russia

Physics department Faculty of science University of Zagreb Zagreb Croatia

Physics Department Panjab University Chandigarh India

Physics Department University of Jammu Jammu India

Physics Department University of Rajasthan Jaipur India

Physik Department Technische Universität München Munich Germany

Physikalisches Institut Eberhard Karls Universität Tübingen Tübingen Germany

Physikalisches Institut Ruprecht Karls Universität Heidelberg Heidelberg Germany

Politecnico di Bariand Sezione INFN Bari Italy

Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt Germany

Russian Federal Nuclear Center Sarov Russia

Saha Institute of Nuclear Physics Homi Bhabha National Institute Kolkata India

School of Physics and Astronomy University of Birmingham Birmingham United Kingdom

Sección Física Departamento de Ciencias Pontificia Universidad Católica del Perú Lima Peru

Sezione INFN Bari Italy

Sezione INFN Bologna Italy

Sezione INFN Cagliari Italy

Sezione INFN Catania Italy

Sezione INFN Padova Italy

Sezione INFN Rome Italy

Sezione INFN Trieste Italy

Sezione INFN Turin Italy

St Petersburg State University St Petersburg Russia

Stefan Meyer Institut für Subatomare Physik Vienna Austria

SUBATECH IMT Atlantique Université de Nantes CNRS IN2P3 Nantes France

Suranaree University of Technology Nakhon Ratchasima Thailand

Technical University of Košice Košice Slovakia

The Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Cracow Poland

The University of Texas at Austin Austin Texas USA

Universidad Autónoma de Sinaloa Culiacán Mexico

Universidade de São Paulo São Paulo Brazil

Universidade Estadual de Campinas Campinas Brazil

Universidade Federal do ABC Santo Andre Brazil

Università degli Studi di Foggia Foggia Italy

Università di Brescia Brescia Italy

Université Clermont Auvergne CNRS IN2P3 LPC Clermont Ferrand France

Université de Lyon CNRS IN2P3 Institut de Physique des 2 Infinis de Lyon Lyon France

Université de Strasbourg CNRS IPHC UMR 7178 F 67000 Strasbourg France Strasbourg France

Université Paris Saclay Centre d'Etudes de Saclay Saclay France

University of Cape Town Cape Town South Africa

University of Houston Houston Texas USA

University of Jyväskylä Jyväskylä Finland

University of Kansas Lawrence Kansas USA

University of Liverpool Liverpool United Kingdom

University of Science and Technology of China Hefei China

University of South Eastern Norway Tonsberg Norway

University of Tennessee Knoxville Tennessee USA

University of the Witwatersrand Johannesburg South Africa

University of Tokyo Tokyo Japan

University of Tsukuba Tsukuba Japan

Variable Energy Cyclotron Centre Homi Bhabha National Institute Kolkata India

Warsaw University of Technology Warsaw Poland

Wayne State University Detroit Michigan USA

Westfälische Wilhelms Universität Münster Institut für Kernphysik Münster Germany

Wigner Research Centre for Physics Budapest Hungary

Yale University New Haven Connecticut USA

Yonsei University Seoul Republic of Korea

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