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Elliptic flow of identified hadrons in Pb-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=2.76 \) TeV
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  • Regular Article - Experimental Physics
  • Open Access
  • Published: 29 June 2015

Elliptic flow of identified hadrons in Pb-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=2.76 \) TeV

  • The ALICE collaboration,
  • B. Abelev69,
  • J. Adam37,
  • D. Adamová77,
  • M. M. Aggarwal81,
  • M. Agnello88,105,
  • A. Agostinelli26,
  • N. Agrawal44,
  • Z. Ahammed124,
  • N. Ahmad18,
  • I. Ahmed15,
  • S. U. Ahn62,
  • S. A. Ahn62,
  • I. Aimo88,105,
  • S. Aiola129,
  • M. Ajaz15,
  • A. Akindinov53,
  • S. N. Alam124,
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  • D. Alexandre96,
  • A. Alici12,99,
  • A. Alkin3,
  • J. Alme35,
  • T. Alt39,
  • S. Altinpinar17,
  • I. Altsybeev123,
  • C. Alves Garcia Prado113,
  • C. Andrei72,
  • A. Andronic91,
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  • T. Antičić92,
  • F. Antinori102,
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  • N. Armesto16,
  • R. Arnaldi105,
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Journal of High Energy Physics volume 2015, Article number: 190 (2015) Cite this article

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A preprint version of the article is available at arXiv.

Abstract

The elliptic flow coefficient (v 2) of identified particles in Pb-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=2.76 \) TeV was measured with the ALICE detector at the Large Hadron Collider (LHC). The results were obtained with the Scalar Product method, a two-particle correlation technique, using a pseudo-rapidity gap of |Δη| > 0.9 between the identified hadron under study and the reference particles. The v 2 is reported for π ±, K±, K 0S , \( \mathrm{p}+\overline{\mathrm{p}} \), ϕ, \( \Lambda +\overline{\Lambda} \), \( {\Xi}^{-}+{\overline{\Xi}}^{+} \) and \( {\Omega}^{-}+{\overline{\Omega}}^{+} \) in several collision centralities. In the low transverse momentum (p T) region, p T < 3 GeV/c, v 2(p T) exhibits a particle mass dependence consistent with elliptic flow accompanied by the transverse radial expansion of the system with a common velocity field. The experimental data for π ± and the combined K± and K 0S results, are described fairly well by hydrodynamic calculations coupled to a hadronic cascade model (VISHNU) for central collisions. However, the same calculations fail to reproduce the v 2(p T) for \( \mathrm{p}+\overline{\mathrm{p}} \), ϕ, \( \Lambda +\overline{\Lambda} \) and \( {\Xi}^{-}+{\overline{\Xi}}^{+} \). For transverse momentum values larger than about 3 GeV/c, particles tend to group according to their type, i.e. mesons and baryons. The present measurements exhibit deviations from the number of constituent quark (NCQ) scaling at the level of ±20% for p T > 3 GeV/c.

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  1. A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation, Yerevan, Armenia

    A. Grigoryan, H. Gulkanyan & V. Papikyan

  2. Benemérita Universidad Autónoma de Puebla, Puebla, Mexico

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

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  5. Budker Institute for Nuclear Physics, Novosibirsk, Russia

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  18. Department of Physics, Aligarh Muslim University, Aligarh, India

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  19. Department of Physics, Ohio State University, Columbus, OH, United States

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  20. Department of Physics, Sejong University, Seoul, South Korea

    D. S. Hwang & S. Kim

  21. Department of Physics, University of Oslo, Oslo, Norway

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  26. Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Bologna, Italy

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  27. Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Catania, Italy

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  28. Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Padova, Italy

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  29. Dipartimento di Fisica ‘E.R. Caianiello’ dell’Università and Gruppo Collegato INFN, Salerno, Italy

    A. De Caro, D. De Gruttola, S. De Pasquale, M. Fusco Girard, P. Pagano & T. Virgili

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    P. Cortese, L. Ramello & M. Sitta

  31. Dipartimento Interateneo di Fisica ‘M. Merlin’ and Sezione INFN, Bari, Italy

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    P. Christiansen, H. M. Ljunggren, A. Ortiz Velasquez, A. Oskarsson, T. Richert, C. Søgaard & E. Stenlund

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    B. A. Hess, H. R. Schmidt & J. Wiechula

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  35. Faculty of Engineering, Bergen University College, Bergen, Norway

    J. Alme, H. A. Erdal, H. Helstrup, K. F. Hetland & B. Kileng

  36. Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia

    M. Meres, M. Pikna, B. Sitar, P. Strmen, A. Szabo & I. Szarka

  37. Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic

    J. Adam, J. Bielčík, M. Broz, J. Cepila, M. Krelina, M. Pachr, V. Petráček, M. Petran, M. Schulc, M. Spacek, V. Wagner & C. Zach

  38. Faculty of Science, P.J. Šafárik University, Košice, Slovakia

    M. Bombara, A. Kravčáková & J. Vrláková

  39. Frankfurt Institute for Advanced Studies, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany

    T. Alt, M. Bach, J. de Cuveland, D. Eschweiler, J. Gerhard, S. Gorbunov, H. Hartmann, D. Hutter, S. Kalcher, S. Kirsch, I. Kisel, T. Kollegger, M. Kretz, V. Lindenstruth, F. Painke, F. Rettig & D. Rohr

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    T. E. Hilden, E. H. O. Pohjoisaho & S. S. Räsänen

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

    N. Agrawal, N. K. Behera, S. Dash, G. Koyithatta Meethaleveedu, J. Kumar, B. K. Nandi, D. Pant & R. Varma

  45. Indian Institute of Technology Indore (IITI), Indore, India

    A. N. Mishra, P. Sahoo, P. Pareek, A. Roy & R. Sahoo

  46. Institut de Physique Nucléaire d’Orsay (IPNO), Université Paris-Sud, CNRS-IN2P3, Orsay, France

    Z. Conesa del Valle, I. Das, B. Espagnon, C. Hadjidakis, I. Lakomov, C. Suire & J. D. Tapia Takaki

  47. Institut für Informatik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany

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

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

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  50. Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg, CNRS-IN2P3, Strasbourg, France

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  51. Institute for Nuclear Research, Academy of Sciences, Moscow, Russia

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  52. Institute for Subatomic Physics of Utrecht University, Utrecht, Netherlands

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  53. Institute for Theoretical and Experimental Physics, Moscow, Russia

    A. Akindinov, S. Kiselev, D. Mal’Kevich, K. Mikhaylov, A. Nedosekin, R. Sultanov, K. Voloshin & N. Zhigareva

  54. Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovakia

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  55. Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic

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  56. Institute of Physics, Bhubaneswar, India

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  57. Institute of Space Science (ISS), Bucharest, Romania

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  58. Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Mexico City, Mexico

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

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  62. Korea Institute of Science and Technology Information, Daejeon, South Korea

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  63. KTO Karatay University, Konya, Turkey

    A. Karasu Uysal & A. Okatan

  64. Laboratoire de Physique Corpusculaire (LPC), Clermont Université, Université Blaise Pascal, CNRS-IN2P3, Clermont-Ferrand, France

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  65. Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS-IN2P3, Grenoble, France

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  66. Laboratori Nazionali di Frascati, INFN, Frascati, Italy

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  67. Laboratori Nazionali di Legnaro, INFN, Legnaro, Italy

    R. A. Ricci & M. Venaruzzo

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  69. Lawrence Livermore National Laboratory, Livermore, CA, United States

    B. Abelev, I. Garishvili & R. Soltz

  70. Moscow Engineering Physics Institute, Moscow, Russia

    V. Belyaev, A. Bogdanov, V. Grigoriev, V. Kaplin, N. Kondratyeva & V. Loginov

  71. National Centre for Nuclear Studies, Warsaw, Poland

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  72. National Institute for Physics and Nuclear Engineering, Bucharest, Romania

    C. Andrei, I. Berceanu, A. Bercuci, V. Catanescu, A. Herghelegiu, M. Petris, M. Petrovici, A. Pop, C. Schiaua & M. G. Tarzila

  73. National Institute of Science Education and Research, Bhubaneswar, India

    B. Mohanty, K. Nayak & S. Singha

  74. Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark

    I. G. Bearden, A. Bilandzic, H. Bøggild, M. Chojnacki, C. H. Christensen, J. J. Gaardhøje, K. Gulbrandsen, A. Hansen, B. S. Nielsen & V. Zaccolo

  75. Nikhef, National Institute for Subatomic Physics, Amsterdam, Netherlands

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  76. Nuclear Physics Group, STFC Daresbury Laboratory, Daresbury, UK

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

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    T. C. Awes, P. Ganoti & D. Silvermyr

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    M. Cherney, B. S. Nilsen & J. E. Seger

  81. Physics Department, Panjab University, Chandigarh, India

    M. M. Aggarwal, A. K. Bhati, S. Parmar & D. Rathee

  82. Physics Department, University of Athens, Athens, Greece

    E. Floratos, F. Roukoutakis, M. Spyropoulou-Stassinaki & M. Vasileiou

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    M. D. Azmi, J. Cleymans, M. Gumbo & S. Murray

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    R. Bala, A. Bhasin, I. R. Bhat, A. Gupta, R. Gupta, B. Potukuchi, S. Rohni, S. Sambyal, S. Sharma & R. Singh

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    R. Raniwala & S. Raniwala

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    A. Borissov, S. U. Chung, J. Seo, J. Song, J. Yi & I.-K. Yoo

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

    A. Andronic, I. C. Arsene, R. Averbeck, P. Braun-Munzinger, P. Foka, U. Frankenfeld, C. Garabatos, M. Ivanov, M. L. Knichel, M. K. Köhler, M. Krzewicki, C. Lippmann, P. Malzacher, A. Marín, N. A. Martin, S. Masciocchi, D. Miskowiec, M. Nicassio, J. Onderwaater, J. Otwinowski, W. J. Park, C. Schmidt, K. Schwarz, K. Schweda, I. Selyuzhenkov, J. Thäder, D. Vranic & J. Wagner

  92. Rudjer Bošković Institute, Zagreb, Croatia

    T. Antičić, M. Planinic, N. Poljak & T. Susa

  93. Russian Federal Nuclear Center (VNIIEF), Sarov, Russia

    D. Budnikov, S. Filchagin, R. Ilkaev, A. Kuryakin, A. Mamonov, S. Nazarenko, V. Punin, A. Tumkin, Y. Vinogradov, A. Vyushin & N. Zaviyalov

  94. Russian Research Centre Kurchatov Institute, Moscow, Russia

    D. Aleksandrov, D. Blau, S. Fokin, M. Ippolitov, Y. Kucheriaev, V. Manko, S. Nikolaev, S. Nikulin, A. Nyanin, D. Peresunko, E. Ryabinkin, Y. Sibiriak, A. Vasiliev, A. Vinogradov, S. Yasnopolskiy & I. Yushmanov

  95. Saha Institute of Nuclear Physics, Kolkata, India

    S. Chattopadhyay, D. Das, K. Das, A. K. Dutta Majumdar, P. Khan, B. Paul, P. Roy & T. Sinha

  96. School of Physics and Astronomy, University of Birmingham, Birmingham, UK

    D. Alexandre, L. S. Barnby, D. Evans, L. D. Hanratty, P. G. Jones, A. Jusko, M. Krivda, G. R. Lee, R. Lietava & O. Villalobos Baillie

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

    E. Calvo Villar & A. M. Gago

  98. Sezione INFN, Bari, Italy

    G. de Cataldo, D. Elia, V. Lenti, V. Manzari, E. Nappi & V. Paticchio

  99. Sezione INFN, Bologna, Italy

    A. Alici, P. Antonioli, F. Cindolo, D. Hatzifotiadou, A. Margotti, R. Nania, F. Noferini, A. Pesci, O. Pinazza, R. Preghenella, E. Scapparone, M. C. S. Williams & C. Zampolli

  100. Sezione INFN, Cagliari, Italy

    C. Cicalo, A. Masoni & S. Siddhanta

  101. Sezione INFN, Catania, Italy

    A. Badalà, A. Palmeri & G. S. Pappalardo

  102. Sezione INFN, Padova, Italy

    F. Antinori, A. Dainese, D. Fabris, A. Toia & R. Turrisi

  103. Sezione INFN, Rome, Italy

    S. Di Liberto & M. A. Mazzoni

  104. Sezione INFN, Trieste, Italy

    E. Fragiacomo, N. Grion, S. Piano & A. Rachevski

  105. Sezione INFN, Turin, Italy

    M. Agnello, I. Aimo, B. Alessandro, R. Arnaldi, S. Bagnasco, E. Bruna, S. Bufalino, P. Cerello, N. De Marco, A. Feliciello, L. Manceau, C. Oppedisano, F. Prino, A. Rivetti & E. Scomparin

  106. SSC IHEP of NRC Kurchatov institute, Protvino, Russia

    M. Bogolyubsky, S. Evdokimov, Y. Kharlov, D. I. Patalakha, B. Polichtchouk, S. Sadovsky, A. Shangaraev & M. Stolpovskiy

  107. SUBATECH, Ecole des Mines de Nantes, Université de Nantes, CNRS-IN2P3, Nantes, France

    L. Aphecetche, G. Batigne, H. Delagrange, B. Erazmus, M. Estienne, M. Germain, A. Lardeux, G. Martínez García, J. Martin Blanco, A. Mas, L. Massacrier, P. Pillot, L. Ronflette, Y. Schutz, A. Shabetai, D. Stocco & M. Wang

  108. Suranaree University of Technology, Nakhon Ratchasima, Thailand

    C. Kobdaj

  109. Technical University of Split FESB, Split, Croatia

    S. Gotovac, E. Mudnic & L. Vickovic

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

    J. Bartke, J. Figiel, E. Gladysz-Dziadus, L. Görlich, M. Kowalski, A. Matyja, C. Mayer, A. Rybicki & I. Sputowska

  111. The University of Texas at Austin, Physics Department,