Study of J/ψ azimuthal anisotropy at forward rapidity in Pb-Pb collisions at √sNN=5.02 TeV

The ALICE collaboration

doi:10.1007/JHEP02(2019)012

Study of J/ψ azimuthal anisotropy at forward rapidity in Pb-Pb collisions at √sNN=5.02 TeV

The ALICE collaboration

Sección de Física

CERN
Variable Energy Cyclotron Centre
University of California at Berkeley
Academy of Sciences of the Czech Republic
Goethe University Frankfurt
University of Lund
Panjab University
Politecnico di Torino
Indian Institute of Technology Bombay
Korea Institute of Science and Technology Information
Yale University
Alikhanov Institute for Theoretical and Experimental Physics
GSI Helmholtzzentrum für Schwerionenforschung
Universidade Estadual de Campinas
Russian Research Centre Kurchatov Institute
Sezione INFN
Central China Normal University
Universidad Nacional Autónoma de México
COMSATS University Islamabad
Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi
National Institute for Nuclear Physics
Bogolyubov Institute for Theoretical Physics Nasu
University of Bergen
St. Petersburg State University
National Institute for Physics and Nuclear Engineering
University of Birmingham
University of Münster
Ruprecht-Karls-Universität Heidelberg
Creighton University
Ruder Boskovic Institute
University of Houston
Lawrence Berkeley National Laboratory
Nantes Université
University of Oslo
Department of Physics Aligarh Muslim University
Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN
Gangneung-Wonju National University
Inha University
University of Jammu
Université Paris-Saclay Centre d’ Études de Saclay (CEA)
Rheinische Friedrich-Wilhelms-Universität Bonn
Homi Bhabha National Institute
Sezione INFN
Hungarian Academy of Sciences
STFC Daresbury Laboratory
Centre de calcul de l'IN2P3
Wayne State University
Joint Institute for Nuclear Research
University of Copenhagen
Institute for Subatomic Physics of Utrecht University
Université de Strasbourg
Benemérita Universidad Autónoma de Puebla
Universidad Autonoma de Sinaloa
Moscow Engineering Physics Institute
Petersburg Nuclear Physics Institute (PNPI)
University of Tennessee
Gauhati University
Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
INFN, Laboratori Nazionali Di Frascati
Faculty of Nuclear Sciences and Physical Engineering
Technical University of Munich
Technische Universität München
Bose Institute
University of Texas at Austin
University of Pavia
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Università di Brescia
University of Liverpool
Universidade de São Paulo
University of Helsinki
Russian Federal Nuclear Center (VNIIEF)
Austrian Academy of Sciences
University of Tsukuba
National Research Foundation
Ohio State University
Technical University of Košice
National Institute for Subatomic Physics
Pontifical Catholic Univ. of Peru
Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear
University of Jyväskylä
Universite Claude Bernard Lyon 1
Pusan National University
University of Cape Town
Université Grenoble Alpes
Oak Ridge National Laboratory
Università del Piemonte Orientale and Gruppo Collegato INFN
Universidade Federal do ABC
Institute of Space Science (ISS)
Indian Institute of Technology Indore
Frankfurt Institute for Advanced Studies
National Centre for Nuclear Studies
University of Zagreb
Institute for High Energy Physics
RAS - Institute for Nuclear Research
National and Kapodistrian University of Athens
Chicago State University
Universidade Federal do Rio Grande do Sul
University of Split
Warsaw University of Technology
A. I. Alikhanyan National Science Laboratory (YereVan Physics Institute) Foundation
Tokyo University
Nagasaki Institute of Applied Science
Western Norway University of Applied Sciences
Centro de Investigación y de Estudios AVanzados (CINVESTAV)
Sejong University
Slovak Academy of Sciences
Yonsei University
KTO Karatay University
Zentrum für Technologietransfer und Telekommunikation (ZTT)
Jeonbuk National University
California Polytechnic State University, San Luis Obispo
Suranaree University of Technology
University of South-Eastern Norway
China Institute of Atomic Energy
M.V.Lomonosov Moscow State University
University of the Witwatersrand
Institute of Physics of the Czech Academy of Sciences
Università degli Studi di Foggia
University of Rome La Sapienza
Comenius University
Budker Institute for Nuclear Physics
University of Rajasthan
University of Wrocław
National Nuclear Research Center
Eberhard Karls Universität Tübingen
Hiroshima University
Nara Women's University
Chinese Academy of Sciences
Indonesian Institute of Sciences

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24 Scopus citations

Abstract

The second (v₂) and third (v₃) flow harmonic coefficients of J/ψ mesons are measured at forward rapidity (2.5 < y < 4.0) in Pb-Pb collisions at sNN=5.02 TeV with the ALICE detector at the LHC. Results are obtained with the scalar product method and reported as a function of transverse momentum, p_T, for various collision centralities. A positive value of J/ψ v₃ is observed with 3.7σ significance. The measurements, compared to those of prompt D⁰ mesons and charged particles at mid-rapidity, indicate an ordering with v_n(J/ψ) < v_n(D⁰) < v_n(h^±) (n = 2, 3) at low and intermediate p_T up to 6 GeV/c and a convergence with v₂(J/ψ) ≈ v₂(D⁰) ≈ v₂(h^±) at high p_T above 6–8 GeV/c. In semi-central collisions (5–40% and 10–50% centrality intervals) at intermediate p_T between 2 and 6 GeV/c, the ratio v₃/v₂ of J/ψ mesons is found to be significantly lower (4.6σ) with respect to that of charged particles. In addition, the comparison to the prompt D⁰-meson ratio in the same p_T interval suggests an ordering similar to that of the v₂ and v₃ coefficients. The J/ψ v₂ coefficient is further studied using the Event Shape Engineering technique. The obtained results are found to be compatible with the expected variations of the eccentricity of the initial-state geometry.

Original language	English
Article number	12
Journal	Journal of High Energy Physics
Volume	2019
Issue number	2
DOIs	https://doi.org/10.1007/JHEP02(2019)012
State	Published - 1 Feb 2019

Keywords

Hadron-Hadron scattering (experiments)

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10.1007/JHEP02(2019)012

Cite this

@article{b38559bf7a884c6e89360546dcb04cb7,

title = "Study of J/ψ azimuthal anisotropy at forward rapidity in Pb-Pb collisions at √sNN=5.02 TeV",

abstract = "The second (v2) and third (v3) flow harmonic coefficients of J/ψ mesons are measured at forward rapidity (2.5 < y < 4.0) in Pb-Pb collisions at sNN=5.02 TeV with the ALICE detector at the LHC. Results are obtained with the scalar product method and reported as a function of transverse momentum, pT, for various collision centralities. A positive value of J/ψ v3 is observed with 3.7σ significance. The measurements, compared to those of prompt D0 mesons and charged particles at mid-rapidity, indicate an ordering with vn(J/ψ) < vn(D0) < vn(h±) (n = 2, 3) at low and intermediate pT up to 6 GeV/c and a convergence with v2(J/ψ) ≈ v2(D0) ≈ v2(h±) at high pT above 6–8 GeV/c. In semi-central collisions (5–40\% and 10–50\% centrality intervals) at intermediate pT between 2 and 6 GeV/c, the ratio v3/v2 of J/ψ mesons is found to be significantly lower (4.6σ) with respect to that of charged particles. In addition, the comparison to the prompt D0-meson ratio in the same pT interval suggests an ordering similar to that of the v2 and v3 coefficients. The J/ψ v2 coefficient is further studied using the Event Shape Engineering technique. The obtained results are found to be compatible with the expected variations of the eccentricity of the initial-state geometry.",

keywords = "Hadron-Hadron scattering (experiments)",

author = "\{The ALICE collaboration\} and S. Acharya and Acosta, \{F. T.\} and D. Adamov{\'a} and A. Adler and J. Adolfsson and Aggarwal, \{M. M.\} and \{Aglieri Rinella\}, G. and M. Agnello and N. Agrawal and Z. Ahammed and Ahn, \{S. U.\} and S. Aiola and A. Akindinov and M. Al-Turany and Alam, \{S. N.\} and Albuquerque, \{D. S.D.\} and D. Aleksandrov and B. Alessandro and Alfanda, \{H. M.\} and \{Alfaro Molina\}, R. and Y. Ali and A. Alici and A. Alkin and J. Alme and T. Alt and L. Altenkamper and I. Altsybeev and Anaam, \{M. N.\} and C. Andrei and D. Andreou and Andrews, \{H. A.\} and A. Andronic and M. Angeletti and V. Anguelov and C. Anson and T. Anti{\v c}i{\'c} and F. Antinori and P. Antonioli and R. Anwar 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 \{Bazo Alba\}, \{J. L.\} and Gago, \{A. M.\}",

note = "Publisher Copyright: {\textcopyright} 2019, The Author(s).",

year = "2019",

month = feb,

day = "1",

doi = "10.1007/JHEP02(2019)012",

language = "English",

volume = "2019",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

number = "2",

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TY - JOUR

T1 - Study of J/ψ azimuthal anisotropy at forward rapidity in Pb-Pb collisions at √sNN=5.02 TeV

AU - The ALICE collaboration

AU - Acharya, S.

AU - Acosta, F. T.

AU - Adamová, D.

AU - Adler, A.

AU - Adolfsson, J.

AU - Aggarwal, M. M.

AU - Aglieri Rinella, G.

AU - Agnello, M.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahn, S. U.

AU - Aiola, S.

AU - Akindinov, A.

AU - Al-Turany, M.

AU - Alam, S. N.

AU - Albuquerque, D. S.D.

AU - Aleksandrov, D.

AU - Alessandro, B.

AU - Alfanda, H. M.

AU - Alfaro Molina, R.

AU - Ali, Y.

AU - Alici, A.

AU - Alkin, A.

AU - Alme, J.

AU - Alt, T.

AU - Altenkamper, L.

AU - Altsybeev, I.

AU - Anaam, M. N.

AU - Andrei, C.

AU - Andreou, D.

AU - Andrews, H. A.

AU - Andronic, A.

AU - Angeletti, M.

AU - Anguelov, V.

AU - Anson, C.

AU - Antičić, T.

AU - Antinori, F.

AU - Antonioli, P.

AU - Anwar, R.

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 - Bazo Alba, J. L.

AU - Gago, A. M.

PY - 2019/2/1

Y1 - 2019/2/1

N2 - The second (v2) and third (v3) flow harmonic coefficients of J/ψ mesons are measured at forward rapidity (2.5 < y < 4.0) in Pb-Pb collisions at sNN=5.02 TeV with the ALICE detector at the LHC. Results are obtained with the scalar product method and reported as a function of transverse momentum, pT, for various collision centralities. A positive value of J/ψ v3 is observed with 3.7σ significance. The measurements, compared to those of prompt D0 mesons and charged particles at mid-rapidity, indicate an ordering with vn(J/ψ) < vn(D0) < vn(h±) (n = 2, 3) at low and intermediate pT up to 6 GeV/c and a convergence with v2(J/ψ) ≈ v2(D0) ≈ v2(h±) at high pT above 6–8 GeV/c. In semi-central collisions (5–40% and 10–50% centrality intervals) at intermediate pT between 2 and 6 GeV/c, the ratio v3/v2 of J/ψ mesons is found to be significantly lower (4.6σ) with respect to that of charged particles. In addition, the comparison to the prompt D0-meson ratio in the same pT interval suggests an ordering similar to that of the v2 and v3 coefficients. The J/ψ v2 coefficient is further studied using the Event Shape Engineering technique. The obtained results are found to be compatible with the expected variations of the eccentricity of the initial-state geometry.

AB - The second (v2) and third (v3) flow harmonic coefficients of J/ψ mesons are measured at forward rapidity (2.5 < y < 4.0) in Pb-Pb collisions at sNN=5.02 TeV with the ALICE detector at the LHC. Results are obtained with the scalar product method and reported as a function of transverse momentum, pT, for various collision centralities. A positive value of J/ψ v3 is observed with 3.7σ significance. The measurements, compared to those of prompt D0 mesons and charged particles at mid-rapidity, indicate an ordering with vn(J/ψ) < vn(D0) < vn(h±) (n = 2, 3) at low and intermediate pT up to 6 GeV/c and a convergence with v2(J/ψ) ≈ v2(D0) ≈ v2(h±) at high pT above 6–8 GeV/c. In semi-central collisions (5–40% and 10–50% centrality intervals) at intermediate pT between 2 and 6 GeV/c, the ratio v3/v2 of J/ψ mesons is found to be significantly lower (4.6σ) with respect to that of charged particles. In addition, the comparison to the prompt D0-meson ratio in the same pT interval suggests an ordering similar to that of the v2 and v3 coefficients. The J/ψ v2 coefficient is further studied using the Event Shape Engineering technique. The obtained results are found to be compatible with the expected variations of the eccentricity of the initial-state geometry.

KW - Hadron-Hadron scattering (experiments)

UR - https://www.scopus.com/pages/publications/85061202505

U2 - 10.1007/JHEP02(2019)012

DO - 10.1007/JHEP02(2019)012

M3 - Article

AN - SCOPUS:85061202505

SN - 1126-6708

VL - 2019

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 2

M1 - 12

ER -

Study of J/ψ azimuthal anisotropy at forward rapidity in Pb-Pb collisions at √sNN=5.02 TeV

Abstract

Keywords

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