Evidence of Spin-Orbital Angular Momentum Interactions in Relativistic Heavy-Ion Collisions

. 2020 Jul 03 ; 125 (1) : 012301.

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

Typ dokumentu časopisecké články

Perzistentní odkaz   https://www.medvik.cz/link/pmid32678650

The first evidence of spin alignment of vector mesons (K^{*0} and ϕ) in heavy-ion collisions at the Large Hadron Collider (LHC) is reported. The spin density matrix element ρ_{00} is measured at midrapidity (|y|<0.5) in Pb-Pb collisions at a center-of-mass energy (sqrt[s_{NN}]) of 2.76 TeV with the ALICE detector. ρ_{00} values are found to be less than 1/3 (1/3 implies no spin alignment) at low transverse momentum (p_{T}<2 GeV/c) for K^{*0} and ϕ at a level of 3σ and 2σ, respectively. No significant spin alignment is observed for the K_{S}^{0} meson (spin=0) in Pb-Pb collisions and for the vector mesons in pp collisions. The measured spin alignment is unexpectedly large but qualitatively consistent with the expectation from models which attribute it to a polarization of quarks in the presence of angular momentum in heavy-ion collisions and a subsequent hadronization by the process of recombination.

A 1 Alikhanyan National Science Laboratory Foundation Yerevan Armenia

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

Bose Institute Department of Physics and Centre for Astroparticle Physics and Space Science Kolkata India

Budker Institute for Nuclear Physics Novosibirsk Russia

California Polytechnic State University San Luis Obispo California United States

Central China Normal University Wuhan China

Centre de Calcul de l'IN2P3 Villeurbanne Lyon France

Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear Havana Cuba

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

Centro Fermi Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi Rome Italy

Chicago State University Chicago Illinois United States

China Institute of Atomic Energy Beijing China

Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia

COMSATS University Islamabad Islamabad Pakistan

Creighton University Omaha Nebraska United States

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 United States

Department of Physics University of Oslo Oslo Norway

Dipartimento di Fisica dell'Università and Sezione INFN Cagliari Italy

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Dipartimento Interateneo di Fisica M Merlin and Sezione INFN 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 Shanghai China

Gangneung Wonju National University Gangneung Republic of Korea

Gauhati University Department of Physics Guwahati India

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

Helsinki Institute of Physics Helsinki Finland

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Hochschule Worms Zentrum für Technologietransfer und Telekommunikation Worms Germany

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Indian Institute of Technology Bombay Mumbai India

Indian Institute of Technology Indore Indore India

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Institut de Physique Nucléaire d'Orsay Université de Paris Sud Université Paris Saclay Orsay France

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Institute for Nuclear Research Academy of Sciences Moscow Russia

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

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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 Subatomique et de Cosmologie Université Grenoble Alpes CNRS IN2P3 Grenoble France

Lawrence Berkeley National Laboratory Berkeley California United States

Lund University Department of Physics Division of Particle Physics Lund Sweden

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 United States

Ohio State University Columbus Ohio United States

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 Bari Bari Italy

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

Rudjer Bošković Institute Zagreb Croatia

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

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

Technische Universität München Excellence Cluster 'Universe' Munich Germany

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

The University of Texas at Austin Austin Texas United States

Universidad Autónoma de Sinaloa Culiacán Mexico

Universidade de São Paulo São Paulo Brazil

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Universidade Federal do ABC Santo Andre Brazil

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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 United States

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University of Liverpool Liverpool United Kingdom

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University of South Eastern Norway Tonsberg Norway

University of Tennessee Knoxville Tennessee United States

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University of Tokyo Tokyo Japan

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Variable Energy Cyclotron Centre Homi Bhabha National Institute Kolkata India

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