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)

Chair of Experimentalphysik - Dense and Strange Hadronic Matter

LAIC, Université d'Auvergne
VECC Kolkata
Nuclear Physics Institute of the Cas
Johann Wolfgang Goethe University
European Organization for Nuclear Research
INFN Sez. di Torino
Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
Aligarh Muslim University
Korea Institute of Science and Technology Information
P. J. Safarik University
GSI Helmholtz Center
Central China Normal University
Universidad Nacional Autónoma de México
COMSATS University Islamabad
University of Houston
University of Bergen
Sezione INFN di Cagliari
Horia Hulubei National Institute of Physics and Nuclear Engineering
University of Münster
Heidelberg University
Dipartimento di Fisica 'G. Galilei' and INFN
Lawrence Berkeley National Laboratory
l'institut du thorax
University of Oslo
Yale University
Institut de Physique Nucléaire
Laboratori Nazionali Del Sud
Gangneung-Wonju National University
Indian Institute of Technology Indore
University of Jammu
Université Paris-Saclay Centre d’Etudes de Saclay (CEA)
Univ of Mining and Metallurgy
Bose Institute
Università di Catania
Technical University of Munich
University of Athens
Wigner Research Centre for Physics
STFC Daresbury Laboratory
University of São Paulo
University of Liverpool
Lund University
The Indian Institute of Technology Bombay
Pontifical Catholic University of Peru San Miguel
Niels Bohr Institutet
Institut Pluridisciplinaire Hubert Curien
Instituto de Ciencias Nucleares de la UNAM
Institute of Space Sciences
Gauhati University
INFN, Laboratori Nazionali Di Frascati
Czech Technical University in Prague
Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences
University of Texas at Austin
Frankfurt Institute for Advanced Studies
University of Pavia
Istituto Nazionale di Fisica Nucleare, Sezione di Pavia
Oak Ridge National Laboratory
Inha University
University of Brescia
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
Politecnico di Bari
Stefan Meyer Institut für Subatomare Physik (SMI)
National Research Foundation
University of the Witwatersrand, Johannesburg
University of Kansas
Universidad Autonoma de Sinaloa
Benemerita Universidad Autonoma de Puebla
INFN- Sezione di Trieste
University Politehnica of Bucharest
University of Lyon
Homi Bhabha National Institute
University of Campinas
Max-Planck-Institut für Physik
Science Park 105
Tsukuba University
Energy and Sustainable Economic Development (ENEA)
University of Birmingham
Politecnico di Torino
University of Grenoble Alpes
University of Eastern Piedmont
UFABC
Sezione INFN di Roma La Sapienza
Warsaw Institute of Technology
University of California at Berkeley
Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear
University of Cape Town
Panjab University
Technical University of Košice
Comenius University
University of Zagreb
Chicago State University
National Nuclear Research Center
UFRGS
University of Tennessee
Nagasaki Institute of Applied Science
Wayne State University
University of Split
the University of Utrecht
A.I. Alikhanyan National Science Laboratory (YerPhi)
University of Tokyo
Yonsei University
University of Bonn
Western Norway University of Applied Sciences
CINVESTAV
Creighton University
University of Jyväskylä
Ohio State University
Suranaree University of Technology
Institute of Experimental Physics Slovak Academy of Sciences
KTO Karatay University
Zentrum für Technologie und Transfer (ZTT)
Pusan National University
Chonbuk National University
Sejong University
California Polytechnic State University, San Luis Obispo
National Center for Nuclear Research (NCBJ)
University of South-Eastern Norway
China Institute of Atomic Energy
University of Science and Technology of China
Fudan University
Multimedia and Distributed Systems Laboratory
University of Foggia
University of Helsinki and Helsinki Institute of Physics
Chungbuk National University
Hiroshima University
University of Rajasthan
Wrocław University
University of Tübingen
Nara Women's University
Sofia University
BRIN
Bogolyubov Institute for Theoretical Physics Nasu
Institute of Physics of the Czech Academy of Sciences

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

61 Scopus citations

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
Journal	Physical Review Letters
Volume	131
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.131.042303
State	Published - 28 Jul 2023

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10.1103/PhysRevLett.131.042303

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@article{be94f7434bd34e39ab6cfebc40b292dd,

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 H. Appelsh{\"a}user and S. Arcelli and R. Arnaldi and Arsene, \{I. C.\} and M. Arslandok and A. Augustinus and R. Averbeck and S. Aziz and Azmi, \{M. D.\} and A. Badal{\`a} and Baek, \{Y. W.\} and X. Bai and R. Bailhache and Y. Bailung and R. Bala and L. Fabbietti",

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",

number = "4",

}

TY - JOUR

T1 - Measurement of the J/ψ Polarization with Respect to the Event Plane in Pb-Pb Collisions at the LHC

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 - Appelshäuser, H.

AU - Arcelli, S.

AU - Arnaldi, R.

AU - Arsene, I. C.

AU - Arslandok, M.

AU - Augustinus, A.

AU - Averbeck, R.

AU - Aziz, S.

AU - Azmi, M. D.

AU - Badalà, A.

AU - Baek, Y. W.

AU - Bai, X.

AU - Bailhache, R.

AU - Bailung, Y.

AU - Bala, R.

AU - Fabbietti, L.

PY - 2023/7/28

Y1 - 2023/7/28

N2 - 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

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

UR - https://www.scopus.com/pages/publications/85167745487

U2 - 10.1103/PhysRevLett.131.042303

DO - 10.1103/PhysRevLett.131.042303

M3 - Article

C2 - 37566833

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

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