Constraining the Chiral Magnetic Effect with charge-dependent azimuthal correlations in Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ = 2.76 and 5.02 TeV

Journal of High Energy Physics, vol. 2020

Abstract

A bstract Systematic studies of charge-dependent two- and three-particle correlations in Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ s NN = 2.76 and 5.02 TeV used to probe the Chiral Magnetic Effect (CME) are presented. These measurements are performed for charged particles in the pseudorapidity ( η ) and transverse momentum ( p T ) ranges | η | < 0 . 8 and 0 . 2 < p T < 5 GeV/ c . A significant charge-dependent signal that becomes more pronounced for peripheral collisions is reported for the CME-sensitive correlators γ 1, 1 = 〈cos( φ α + φ β − 2Ψ 2 )〉 and γ 1, − 3 = 〈cos( φ α − 3 φ β + 2Ψ 2 )〉. The results are used to estimate the contribution of background effects, associated with local charge conservation coupled to anisotropic flow modulations, to measurements of the CME. A blast-wave parametrisation that incorporates local charge conservation tuned to reproduce the centrality dependent background effects is not able to fully describe the measured γ 1 , 1 . Finally, the charge and centrality dependence of mixed-harmonics three-particle correlations, of the form γ 1, 2 = 〈cos( φ α + 2 φ β − 3Ψ 3 )〉, which are insensitive to the CME signal, verify again that background contributions dominate the measurement of γ 1 , 1 .

Authors 100

1. S. Acharya

   Variable Energy Cyclotron Centre · Homi Bhabha National Institute

   Affiliation as printed

   Variable Energy Cyclotron Centre, Homi Bhabha National Institute, Kolkata, India

2. D. Adamová

   Czech Academy of Sciences, Nuclear Physics Institute

   Affiliation as printed

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

3. A. Adler

   Goethe University Frankfurt

   Affiliation as printed

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

4. Jonatan Adolfsson

   Lund University

   Affiliation as printed

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

5. M. M. Aggarwal

   Panjab University

   Affiliation as printed

   Physics Department, Panjab University, Chandigarh, India

6. G. Aglieri Rinella

   European Organization for Nuclear Research

   Affiliation as printed

   European Organization for Nuclear Research (CERN), Geneva, Switzerland

7. M. Agnello

   Politecnico di Torino · Istituto Nazionale di Fisica Nucleare, Sezione di Torino

   Affiliation as printed

   Dipartimento DISAT del Politecnico and Sezione INFN, Turin, Italy

8. N. Agrawal

   Centro Ricerche Enrico Fermi

   Affiliation as printed

   Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche "Enrico Fermi', Rome, Italy

9. Z. Ahammed

   Variable Energy Cyclotron Centre · Homi Bhabha National Institute

   Affiliation as printed

   Variable Energy Cyclotron Centre, Homi Bhabha National Institute, Kolkata, India

10. S. Ahmad

    Aligarh Muslim University

    Affiliation as printed

    Department of Physics, Aligarh Muslim University, Aligarh, India

11. S. U. Ahn

    Korea Institute of Science & Technology Information

    Affiliation as printed

    Korea Institute of Science and Technology Information, Daejeon, Republic of Korea

12. Z. Akbar

    Indonesian Institute of Sciences

    Affiliation as printed

    Indonesian Institute of Sciences, Jakarta, Indonesia

13. A. Akindinov

    Kurchatov Institute

    Affiliation as printed

    NRC "Kurchatov" Institute — ITEP, Moscow, Russia

14. M. Al-Turany

    GSI Helmholtz Centre for Heavy Ion Research · ExtreMe Matter Institute EMMI

    Affiliation as printed

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

15. Sk Noor Alam

    Fudan University

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    Fudan University, Shanghai, China

16. D. S. D. Albuquerque

    Universidade Estadual de Campinas (UNICAMP)

    Affiliation as printed

    Universidade Estadual de Campinas (UNICAMP), Campinas, Brazil

17. D. Aleksandrov

    Kurchatov Institute

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    National Research Centre Kurchatov Institute, Moscow, Russia

18. B. Alessandro

    Istituto Nazionale di Fisica Nucleare, Sezione di Torino

    Affiliation as printed

    INFN, Sezione di Torino, Turin, Italy

19. H. M. Alfanda

    Central China Normal University

    Affiliation as printed

    Central China Normal University, Wuhan, China

20. R. Alfaro Molina

    Universidad Nacional Autónoma de México

    Affiliation as printed

    Instituto de Física, Universidad Nacional Autónoma de México, Mexico City, Mexico

21. Bushra Ali

    Central China Normal University

    Affiliation as printed

    Central China Normal University, Wuhan, China

22. Y. Ali

    COMSATS University Islamabad

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    COMSATS University Islamabad, Islamabad, Pakistan

23. A. Alici

    Centro Ricerche Enrico Fermi

    Affiliation as printed

    Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche "Enrico Fermi', Rome, Italy

24. A. Alkin

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

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

25. J. Alme

    University of Bergen

    Affiliation as printed

    Department of Physics and Technology, University of Bergen, Bergen, Norway

26. T. Alt

    University of Bergen

    Affiliation as printed

    Department of Physics and Technology, University of Bergen, Bergen, Norway

27. L. Altenkamper

    University of Bergen

    Affiliation as printed

    Department of Physics and Technology, University of Bergen, Bergen, Norway

28. I. Altsybeev

    St Petersburg University

    Affiliation as printed

    St. Petersburg State University, St. Petersburg, Russia

29. M. N. Anaam

    Central China Normal University

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    Central China Normal University, Wuhan, China

30. C. Andrei

    Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering

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    Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania

31. D. Andreou

    European Organization for Nuclear Research

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    European Organization for Nuclear Research (CERN), Geneva, Switzerland

32. A. Andronic

    University of Münster

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    Westfälische Wilhelms-Universität Münster, Institut für Kernphysik, Münster, Germany

33. Massimo Angeletti

    European Organization for Nuclear Research

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    European Organization for Nuclear Research (CERN), Geneva, Switzerland

34. V. Anguelov

    Heidelberg University

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    Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany

35. C. Anson

    Creighton University

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    Creighton University, Omaha, Nebraska, United States

36. T. Antičić

    Ruđer Bošković Institute

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    Rudjer Bošković Institute, Zagreb, Croatia

37. F. Antinori

    Istituto Nazionale di Fisica Nucleare, Sezione di Padova

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    INFN, Sezione di Padova, Padova, Italy

38. P. Antonioli

    Istituto Nazionale di Fisica Nucleare, Sezione di Bologna

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    INFN, Sezione di Bologna, Bologna, Italy

39. N. Apadula

    Lawrence Berkeley National Laboratory

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    Lawrence Berkeley National Laboratory, Berkeley, California, United States

40. L. Aphecetche

    Centre National de la Recherche Scientifique · Laboratoire de Physique Subatomique et des Technologies Associées · IMT Atlantique · Institut National de Physique Nucléaire et de Physique des Particules · Université de Nantes · Nantes Université

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    SUBATECH, IMT Atlantique, Université de Nantes, CNRS-IN2P3, Nantes, France

41. H. Appelshäuser

    Goethe University Frankfurt

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    Institut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany

42. S. Arcelli

    Istituto Nazionale di Fisica Nucleare, Sezione di Bologna · University of Bologna

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    Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Bologna, Italy

43. R. Arnaldi

    Istituto Nazionale di Fisica Nucleare, Sezione di Torino

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    INFN, Sezione di Torino, Turin, Italy

44. M. Arratia

    Lawrence Berkeley National Laboratory

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    Lawrence Berkeley National Laboratory, Berkeley, California, United States

45. I. C. Arsene

    University of Oslo

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    Department of Physics, University of Oslo, Oslo, Norway

46. M. Arslandok

    Heidelberg University

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    Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany

47. A. Augustinus

    European Organization for Nuclear Research

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    European Organization for Nuclear Research (CERN), Geneva, Switzerland

48. Ralf Peter Averbeck

    GSI Helmholtz Centre for Heavy Ion Research · ExtreMe Matter Institute EMMI

    Affiliation as printed

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

49. S. Aziz

    Laboratoire de Physique des 2 Infinis Irène Joliot-Curie

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    Laboratoire de Physique des 2 Infinis, Irène Joliot-Curie, Orsay, France

50. M. D. Azmi

    Aligarh Muslim University

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    Department of Physics, Aligarh Muslim University, Aligarh, India

51. A. Badalà

    Istituto Nazionale di Fisica Nucleare, Sezione di Catania

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    INFN, Sezione di Catania, Catania, Italy

52. Y. W. Baek

    Gangneung–Wonju National University

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    Gangneung-Wonju National University, Gangneung, Republic of Korea

53. S. Bagnasco

    Istituto Nazionale di Fisica Nucleare, Sezione di Torino

    Affiliation as printed

    INFN, Sezione di Torino, Turin, Italy

54. X. Bai

    GSI Helmholtz Centre for Heavy Ion Research · ExtreMe Matter Institute EMMI

    Affiliation as printed

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

55. R. Bailhache

    Goethe University Frankfurt

    Affiliation as printed

    Institut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany

56. Renu Bala

    University of Jammu

    Affiliation as printed

    Physics Department, University of Jammu, Jammu, India

57. A. Balbino

    Politecnico di Torino · Istituto Nazionale di Fisica Nucleare, Sezione di Torino

    Affiliation as printed

    Dipartimento DISAT del Politecnico and Sezione INFN, Turin, Italy

58. Alberto Baldisseri

    Commissariat à l'Énergie Atomique et aux Énergies Alternatives · Université Paris-Saclay · CEA Paris-Saclay - Etablissement de Saclay · Institut de Recherche sur les Lois Fondamentales de l'Univers · Département de Physique Nucléaire

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    Université Paris-Saclay Centre d'Etudes de Saclay (CEA), IRFU, Départment de Physique Nucléaire (DPhN), Saclay, France

59. M. Ball

    University of Bonn

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

60. S. Balouza

    Technical University of Munich

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    Physik Department, Technische Universität München, Munich, Germany

61. D. Banerjee

    Bose Institute

    Affiliation as printed

    Bose Institute, Department of Physics and Centre for Astroparticle Physics and Space Science (CAPSS), Kolkata, India

62. R. Barbera

    University of Catania · Istituto Nazionale di Fisica Nucleare, Sezione di Catania

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    Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Catania, Italy

63. L. Barioglio

    Istituto Nazionale di Fisica Nucleare, Sezione di Torino · University of Turin

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    Dipartimento di Fisica dell'Università and Sezione INFN, Turin, Italy

64. G. G. Barnaföldi

    HUN-REN Wigner Research Centre for Physics

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    Wigner Research Centre for Physics, Budapest, Hungary

65. L. S. Barnby

    Daresbury Laboratory · Sci-Tech Daresbury

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    Nuclear Physics Group, STFC Daresbury Laboratory, Daresbury, United Kingdom

66. Valerie Ramillien Barret

    Centre National de la Recherche Scientifique · Université Clermont Auvergne · Laboratoire de Physique de Clermont Auvergne · Institut National de Physique Nucléaire et de Physique des Particules

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    Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France

67. P. Bartalini

    Central China Normal University

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    Central China Normal University, Wuhan, China

68. C. Bartels

    University of Liverpool

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    University of Liverpool, Liverpool, United Kingdom

69. K. Barth

    European Organization for Nuclear Research

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    European Organization for Nuclear Research (CERN), Geneva, Switzerland

70. E. Bartsch

    Goethe University Frankfurt

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    Institut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany

71. F. Baruffaldi

    University of Padua · Istituto Nazionale di Fisica Nucleare, Sezione di Padova

    Affiliation as printed

    Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Padova, Italy

72. N. Bastid

    Centre National de la Recherche Scientifique · Université Clermont Auvergne · Laboratoire de Physique de Clermont Auvergne · Institut National de Physique Nucléaire et de Physique des Particules

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    Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France

73. S. Basu

    Wayne State University

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    Wayne State University, Detroit, Michigan, United States

74. G. Batigne

    Centre National de la Recherche Scientifique · Laboratoire de Physique Subatomique et des Technologies Associées · IMT Atlantique · Institut National de Physique Nucléaire et de Physique des Particules · Université de Nantes · Nantes Université

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    SUBATECH, IMT Atlantique, Université de Nantes, CNRS-IN2P3, Nantes, France

75. B. Batyunya

    Joint Institute for Nuclear Research

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    Joint Institute for Nuclear Research (JINR), Dubna, Russia

76. D. Bauri

    Indian Institute of Technology Bombay

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    Indian Institute of Technology Bombay (IIT), Mumbai, India

77. J. L. Bazo Alba

    Pontificia Universidad Católica del Perú

    Affiliation as printed

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

78. I. G. Bearden

    University of Copenhagen

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    Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark

79. C. Beattie

    Yale University

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    Yale University, New Haven, Connecticut, United States

80. C. Bedda

    Utrecht University · National Institute for Subatomic Physics

    Affiliation as printed

    Institute for Subatomic Physics, Utrecht University/Nikhef, Utrecht, Netherlands

81. N. K. Behera

    Inha University

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    Inha University, Incheon, Republic of Korea

82. I. Belikov

    Centre National de la Recherche Scientifique · Institut Pluridisciplinaire Hubert Curien · Université de Strasbourg

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

83. A. D. C. Bell Hechavarria

    University of Münster

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    Westfälische Wilhelms-Universität Münster, Institut für Kernphysik, Münster, Germany

84. F. Bellini

    European Organization for Nuclear Research

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    European Organization for Nuclear Research (CERN), Geneva, Switzerland

85. R. Bellwied

    University of Houston

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    University of Houston, Houston, Texas, United States

86. V. Belyaev

    National Research Nuclear University MEPhI

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    NRNU Moscow Engineering Physics Institute, Moscow, Russia

87. G. Bencédi

    HUN-REN Wigner Research Centre for Physics

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    Wigner Research Centre for Physics, Budapest, Hungary

88. S. Beolè

    Istituto Nazionale di Fisica Nucleare, Sezione di Torino · University of Turin

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    Dipartimento di Fisica dell'Università and Sezione INFN, Turin, Italy

89. A. Bercuci

    Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering

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    Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania

90. Yaroslav A. Berdnikov

    Petersburg Nuclear Physics Institute

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    Petersburg Nuclear Physics Institute, Gatchina, Russia

91. A. Berdnikova

    Heidelberg University

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    Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany

92. D. Berényi

    HUN-REN Wigner Research Centre for Physics

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    Wigner Research Centre for Physics, Budapest, Hungary

93. R. A. Bertens

    University of Tennessee at Knoxville

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    University of Tennessee, Knoxville, Tennessee, United States

94. D. Berzano

    Istituto Nazionale di Fisica Nucleare, Sezione di Torino

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    INFN, Sezione di Torino, Turin, Italy

95. Mihaela Gabriela Besoiu

    Institute of Space Science - INFLPR Subsidiary

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    Institute of Space Science (ISS), Bucharest, Romania

96. L. Betev

    European Organization for Nuclear Research

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    European Organization for Nuclear Research (CERN), Geneva, Switzerland

97. A. Bhasin

    University of Jammu

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    Physics Department, University of Jammu, Jammu, India

98. I. R. Bhat

    University of Jammu

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    Physics Department, University of Jammu, Jammu, India

99. M. A. Bhat

    Bose Institute

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    Bose Institute, Department of Physics and Centre for Astroparticle Physics and Space Science (CAPSS), Kolkata, India

100. H. Bhatt

     Gauhati University

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     Gauhati University, Department of Physics, Guwahati, India