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Two-particle azimuthal correlations as a probe of collective behaviour in deep inelastic ep scattering at HERA

Journal of High Energy Physics volume 2020, Article number: 70 (2020) Cite this article

A preprint version of the article is available at arXiv.

Abstract

Two-particle azimuthal correlations have been measured in neutral current deep inelastic ep scattering with virtuality Q2> 5 GeV2 at a centre-of-mass energy \( \sqrt{s} \) = 318 GeV recorded with the ZEUS detector at HERA. The correlations of charged particles have been measured in the range of laboratory pseudorapidity −1.5 < η < 2.0 and transverse momentum 0.1 < pT< 5.0 GeV and event multiplicities Nch up to six times larger than the average 〈Nch〉 ≈ 5. The two-particle correlations have been measured in terms of the angular observables cn{2} = 〈〈cosnΔφ〉〉, where n is between 1 and 4 and ∆φ is the relative azimuthal angle between the two particles. Comparisons with available models of deep inelastic scattering, which are tuned to reproduce inclusive particle production, suggest that the measured two-particle correlations are dominated by contributions from multijet production. The correlations observed here do not indicate the kind of collective behaviour recently observed at the highest RHIC and LHC energies in high-multiplicity hadronic collisions.

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Author notes

  1. M. Corradi

    Present address: INFN Roma, Roma, Italy

  2. R. Aggarwal

    Present address: DST-Inspire Faculty, Department of Technology, SPPU, Pune, India

  3. P. Kaur

    Present address: Sant Longowal Institute of Engineering and Technology, Longowal, Punjab, India

  4. R. Ciesielski

    Present address: Rockefeller University, New York, NY, 10065, U.S.A.

  5. U. Klein

    Present address: University of Liverpool, Liverpool, United Kingdom

  6. O. Kuprash

    Present address: University of Freiburg, Freiburg, Germany

  7. J. Malka, J. Sztuk-Dambietz & M. Turcato

    Present address: European X-ray Free-Electron Laser facility GmbH, Hamburg, Germany

  8. O. Zenaiev

    Present address: Hamburg University, Hamburg, Germany

  9. N. H. Brook

    Present address: University of Bath, Bath, United Kingdom

Affiliations

  1. INFN Bologna, Bologna, Italy

    A. Bruni, M. Corradi & A. Polini

  2. Physikalisches Institut der Universität Bonn, Bonn, Germany

    I. Brock & E. Paul

  3. Panjab University, Department of Physics, Chandigarh, India

    R. Aggarwal & P. Kaur

  4. Calabria University, Physics Department and INFN, Cosenza, Italy

    M. Capua & E. Tassi

  5. National Centre for Particle Physics, Universiti Malaya, 50603, Kuala Lumpur, Malaysia

    W. A. T. Wan Abdullah

  6. The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland

    J. Chwastowski, P. Stopa & L. Zawiejski

  7. AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow, Poland

    L. Adamczyk & M. Przybycień

  8. Department of Physics, Jagellonian University, Krakow, Poland

    W. Słomiński

  9. Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany

    O. Behnke, U. Behrens, R. Ciesielski, J. Ferrando, A. Geiser, N. Z. Jomhari, U. Klein, H. Kowalski, O. Kuprash, B. Löhr, I. Makarenko, J. Malka, U. Schneekloth, T. Schörner-Sadenius, N. Stefaniuk, O. Turkot, K. Wichmann & O. Zenaiev

  10. Deutsches Elektronen-Synchrotron DESY, Zeuthen, Germany

    I. Bloch

  11. School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom

    P. J. Bussey, D. H. Saxon & I. O. Skillicorn

  12. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany

    S. Masciocchi & I. Selyuzhenkov

  13. Hamburg University, Institute of Experimental Physics, Hamburg, Germany

    E. Gallo, R. Klanner, N. Kovalchuk, E. Lohrmann, J. Sztuk-Dambietz & M. Turcato

  14. Physikalisches Institute, University of Heidelberg, Heidelberg, Germany

    D. Gangadharan & J. Onderwaater

  15. Institute for Theoretical Physics, University of Heidelberg, Heidelberg, Germany

    S. Floerchinger

  16. Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan

    K. Nagano, K. Tokushuku & S. Yamada

  17. Department of Physics, Kobe University, Kobe, Japan

    Y. Yamazaki

  18. Department of Nuclear Physics, National Taras Shevchenko University of Kyiv, Kyiv, Ukraine

    V. Aushev, I. Kadenko, Yu. Onishchuk, I. Pidhurskyi & M. Shchedrolosiev

  19. Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, Moscow, Russia

    R. K. Dementiev, L. K. Gladilin, Yu. A. Golubkov, I. A. Korzhavina, B. B. Levchenko, O. Yu. Lukina & L. M. Shcheglova

  20. Max-Planck-Institut für Physik, München, Germany

    I. Abt, A. Caldwell & A. Verbytskyi

  21. Department of Physics, University of Oxford, Oxford, United Kingdom

    A. M. Cooper-Sarkar, B. Foster & C. Gwenlan

  22. INFN Padova, Padova, Italy

    A. Bertolin, S. Dusini & L. Stanco

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

    R. Brugnera, A. Garfagnini & A. Longhin

  24. Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv, Israel

    S. Kananov & A. Levy

  25. Department of Physics, Temple University, Philadelphia, PA, 19122, U.S.A.

    J. D. Nam, A. Quintero & B. Surrow

  26. Department of Physics, Tokyo Institute of Technology, Tokyo, Japan

    M. Kuze

  27. Università di Torino and INFN, Torino, Italy

    A. Solano

  28. Università del Piemonte Orientale, Novara, and INFN, Torino, Italy

    M. Ruspa

  29. Physics and Astronomy Department, University College London, London, United Kingdom

    N. H. Brook & M. Wing

  30. Faculty of Physics, University of Warsaw, Warsaw, Poland

    J. Ciborowski, G. Grzelak & A. F. Żarnecki

  31. National Centre for Nuclear Research, Warsaw, Poland

    T. Tymieniecka

  32. Department of Particle Physics and Astrophysics, Weizmann Institute, Rehovot, Israel

    D. Hochman & U. Karshon

  33. Department of Physics, York University, Toronto, Ontario, M3J 1P3, Canada

    C. D. Catterall

  34. Physikalisches Institute of the University of Heidelberg, Heidelberg, Germany

    S. Masciocchi

  35. DESY and University of Hamburg, Hamburg, Germany

    B. Foster

  36. DESY, Hamburg, Germany

    E. Gallo

  37. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany

    J. Onderwaater

  38. Lodz University, Lodz, Poland

    J. Ciborowski

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  1. I. Abt
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  2. L. Adamczyk
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  9. I. Brock
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  20. A. M. Cooper-Sarkar
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  21. M. Corradi
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  24. J. Ferrando
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  25. S. Floerchinger
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  26. B. Foster
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  30. A. Geiser
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  39. U. Karshon
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  40. P. Kaur
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  42. U. Klein
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Consortia

The ZEUS collaboration

Corresponding author

Correspondence to M. Wing.

Additional information

ArXiv ePrint: 1912.07431

Supported by the Italian National Institute for Nuclear Physics (INFN) (INFN Bologna, Bologna, Italy, Calabria University, Physics Department and INFN, Cosenza, Italy, INFN Padova, Padova, Italy, Dipartimento di Fisica e Astronomia dell’ Università and INFN, Padova, Italy, Università di Torino and INFN, Torino, Italy, Università del Piemonte Orientale, Novara, and INFN, Torino, Italy)

Supported by the German Federal Ministry for Education and Research (BMBF), under contract No. 05 H09PDF (Physikalisches Institut der Universität Bonn, Bonn, Germany)

Supported by HIR grant UM.C/625/1/HIR/149 and UMRG grants RU006-2013, RP012A-13AFR and RP012B-13AFR from Universiti Malaya, and ERGS grant ER004-2012A from the Ministry of Education, Malaysia (National Centre for Particle Physics, Universiti Malaya, 50603 Kuala Lumpur, Malaysia)

Supported by the Polish National Science Centre (NCN) grant no. DEC-2014/13/B/ST2/02486 (Department of Physics, Jagellonian University, Krakow, Poland)

Supported by the Science and Technology Facilities Council, U.K. (School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom, Department of Physics, University of Oxford, Oxford, United Kingdom, Physics and Astronomy Department, University College London, London, United Kingdom)

Supported by the German Federal Ministry for Education and Research (BMBF), under contract No. 05h09GUF, and the SFB 676 of the Deutsche Forschungsgemeinschaft (DFG) (Hamburg University, Institute of Experimental Physics, Hamburg, Germany)

Supported by the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) and its grants for Scientific Research (Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan, Department of Physics, Kobe University, Kobe, Japan, Department of Physics, Tokyo Institute of Technology, Tokyo, Japan)

Supported by the Israel Science Foundation (Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv, Israel)

Supported in part by the Office of Nuclear Physics within the U.S. DOE Office of Science (Department of Physics, Temple University, Philadelphia, PA 19122, U.S.A.)

Supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) (Department of Physics, York University, Ontario, Canada M3J 1P3)

This work is part of and supported by the DFG Collaborative Research Centre “SFB 1225 (ISOQUANT)” (GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany, Physikalisches Institute, University of Heidelberg, Heidelberg, Germany, Institute for Theoretical Physics, University of Heidelberg, Heidelberg, Germany)

Supported by DESY (M. Wing)

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The ZEUS collaboration., Abt, I., Adamczyk, L. et al. Two-particle azimuthal correlations as a probe of collective behaviour in deep inelastic ep scattering at HERA. J. High Energ. Phys. 2020, 70 (2020). https://doi.org/10.1007/JHEP04(2020)070

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Keywords

  • Collective flow
  • Lepton-Nucleon Scattering (experiments)
  • Particle correlations and fluctuations
  • Quark gluon plasma