Journal of High Energy Physics (Apr 2020)
Two-particle azimuthal correlations as a probe of collective behaviour in deep inelastic ep scattering at HERA
- The ZEUS collaboration,
- I. Abt,
- L. Adamczyk,
- R. Aggarwal,
- V. Aushev,
- O. Behnke,
- U. Behrens,
- A. Bertolin,
- I. Bloch,
- I. Brock,
- N. H. Brook,
- R. Brugnera,
- A. Bruni,
- P. J. Bussey,
- A. Caldwell,
- M. Capua,
- C. D. Catterall,
- J. Chwastowski,
- J. Ciborowski,
- R. Ciesielski,
- A. M. Cooper-Sarkar,
- M. Corradi,
- R. K. Dementiev,
- S. Dusini,
- J. Ferrando,
- S. Floerchinger,
- B. Foster,
- E. Gallo,
- D. Gangadharan,
- A. Garfagnini,
- A. Geiser,
- L. K. Gladilin,
- Yu. A. Golubkov,
- G. Grzelak,
- C. Gwenlan,
- D. Hochman,
- N. Z. Jomhari,
- I. Kadenko,
- S. Kananov,
- U. Karshon,
- P. Kaur,
- R. Klanner,
- U. Klein,
- I. A. Korzhavina,
- N. Kovalchuk,
- H. Kowalski,
- O. Kuprash,
- M. Kuze,
- B. B. Levchenko,
- A. Levy,
- B. Löhr,
- E. Lohrmann,
- A. Longhin,
- O. Yu. Lukina,
- I. Makarenko,
- J. Malka,
- S. Masciocchi,
- K. Nagano,
- J. D. Nam,
- J. Onderwaater,
- Yu. Onishchuk,
- E. Paul,
- I. Pidhurskyi,
- A. Polini,
- M. Przybycień,
- A. Quintero,
- M. Ruspa,
- D. H. Saxon,
- U. Schneekloth,
- T. Schörner-Sadenius,
- I. Selyuzhenkov,
- M. Shchedrolosiev,
- L. M. Shcheglova,
- I. O. Skillicorn,
- W. Słomiński,
- A. Solano,
- L. Stanco,
- N. Stefaniuk,
- P. Stopa,
- B. Surrow,
- J. Sztuk-Dambietz,
- E. Tassi,
- K. Tokushuku,
- M. Turcato,
- O. Turkot,
- T. Tymieniecka,
- A. Verbytskyi,
- W. A. T. Wan Abdullah,
- K. Wichmann,
- M. Wing,
- S. Yamada,
- Y. Yamazaki,
- A. F. Żarnecki,
- L. Zawiejski,
- O. Zenaiev
Affiliations
- The ZEUS collaboration
- I. Abt
- Max-Planck-Institut für Physik
- L. Adamczyk
- AGH University of Science and Technology, Faculty of Physics and Applied Computer Science
- R. Aggarwal
- Panjab University, Department of Physics
- V. Aushev
- Department of Nuclear Physics, National Taras Shevchenko University of Kyiv
- O. Behnke
- Deutsches Elektronen-Synchrotron DESY
- U. Behrens
- Deutsches Elektronen-Synchrotron DESY
- A. Bertolin
- INFN Padova
- I. Bloch
- Deutsches Elektronen-Synchrotron DESY
- I. Brock
- Physikalisches Institut der Universität Bonn
- N. H. Brook
- Physics and Astronomy Department, University College London
- R. Brugnera
- Dipartimento di Fisica e Astronomia dell’ Università and INFN
- A. Bruni
- INFN Bologna
- P. J. Bussey
- School of Physics and Astronomy, University of Glasgow
- A. Caldwell
- Max-Planck-Institut für Physik
- M. Capua
- Calabria University, Physics Department and INFN
- C. D. Catterall
- Department of Physics, York University
- J. Chwastowski
- The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences
- J. Ciborowski
- Faculty of Physics, University of Warsaw
- R. Ciesielski
- Deutsches Elektronen-Synchrotron DESY
- A. M. Cooper-Sarkar
- Department of Physics, University of Oxford
- M. Corradi
- INFN Bologna
- R. K. Dementiev
- Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics
- S. Dusini
- INFN Padova
- J. Ferrando
- Deutsches Elektronen-Synchrotron DESY
- S. Floerchinger
- Institute for Theoretical Physics, University of Heidelberg
- B. Foster
- Department of Physics, University of Oxford
- E. Gallo
- Hamburg University, Institute of Experimental Physics
- D. Gangadharan
- Physikalisches Institute, University of Heidelberg
- A. Garfagnini
- Dipartimento di Fisica e Astronomia dell’ Università and INFN
- A. Geiser
- Deutsches Elektronen-Synchrotron DESY
- L. K. Gladilin
- Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics
- Yu. A. Golubkov
- Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics
- G. Grzelak
- Faculty of Physics, University of Warsaw
- C. Gwenlan
- Department of Physics, University of Oxford
- D. Hochman
- Department of Particle Physics and Astrophysics, Weizmann Institute
- N. Z. Jomhari
- Deutsches Elektronen-Synchrotron DESY
- I. Kadenko
- Department of Nuclear Physics, National Taras Shevchenko University of Kyiv
- S. Kananov
- Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University
- U. Karshon
- Department of Particle Physics and Astrophysics, Weizmann Institute
- P. Kaur
- Panjab University, Department of Physics
- R. Klanner
- Hamburg University, Institute of Experimental Physics
- U. Klein
- Deutsches Elektronen-Synchrotron DESY
- I. A. Korzhavina
- Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics
- N. Kovalchuk
- Hamburg University, Institute of Experimental Physics
- H. Kowalski
- Deutsches Elektronen-Synchrotron DESY
- O. Kuprash
- Deutsches Elektronen-Synchrotron DESY
- M. Kuze
- Department of Physics, Tokyo Institute of Technology
- B. B. Levchenko
- Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics
- A. Levy
- Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University
- B. Löhr
- Deutsches Elektronen-Synchrotron DESY
- E. Lohrmann
- Hamburg University, Institute of Experimental Physics
- A. Longhin
- Dipartimento di Fisica e Astronomia dell’ Università and INFN
- O. Yu. Lukina
- Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics
- I. Makarenko
- Deutsches Elektronen-Synchrotron DESY
- J. Malka
- Deutsches Elektronen-Synchrotron DESY
- S. Masciocchi
- GSI Helmholtzzentrum für Schwerionenforschung GmbH
- K. Nagano
- Institute of Particle and Nuclear Studies, KEK
- J. D. Nam
- Department of Physics, Temple University
- J. Onderwaater
- Physikalisches Institute, University of Heidelberg
- Yu. Onishchuk
- Department of Nuclear Physics, National Taras Shevchenko University of Kyiv
- E. Paul
- Physikalisches Institut der Universität Bonn
- I. Pidhurskyi
- Department of Nuclear Physics, National Taras Shevchenko University of Kyiv
- A. Polini
- INFN Bologna
- M. Przybycień
- AGH University of Science and Technology, Faculty of Physics and Applied Computer Science
- A. Quintero
- Department of Physics, Temple University
- M. Ruspa
- Università del Piemonte Orientale, Novara, and INFN
- D. H. Saxon
- School of Physics and Astronomy, University of Glasgow
- U. Schneekloth
- Deutsches Elektronen-Synchrotron DESY
- T. Schörner-Sadenius
- Deutsches Elektronen-Synchrotron DESY
- I. Selyuzhenkov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH
- M. Shchedrolosiev
- Department of Nuclear Physics, National Taras Shevchenko University of Kyiv
- L. M. Shcheglova
- Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics
- I. O. Skillicorn
- School of Physics and Astronomy, University of Glasgow
- W. Słomiński
- Department of Physics, Jagellonian University
- A. Solano
- Università di Torino and INFN
- L. Stanco
- INFN Padova
- N. Stefaniuk
- Deutsches Elektronen-Synchrotron DESY
- P. Stopa
- The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences
- B. Surrow
- Department of Physics, Temple University
- J. Sztuk-Dambietz
- Hamburg University, Institute of Experimental Physics
- E. Tassi
- Calabria University, Physics Department and INFN
- K. Tokushuku
- Institute of Particle and Nuclear Studies, KEK
- M. Turcato
- Hamburg University, Institute of Experimental Physics
- O. Turkot
- Deutsches Elektronen-Synchrotron DESY
- T. Tymieniecka
- National Centre for Nuclear Research
- A. Verbytskyi
- Max-Planck-Institut für Physik
- W. A. T. Wan Abdullah
- National Centre for Particle Physics, Universiti Malaya
- K. Wichmann
- Deutsches Elektronen-Synchrotron DESY
- M. Wing
- Physics and Astronomy Department, University College London
- S. Yamada
- Institute of Particle and Nuclear Studies, KEK
- Y. Yamazaki
- Department of Physics, Kobe University
- A. F. Żarnecki
- Faculty of Physics, University of Warsaw
- L. Zawiejski
- The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences
- O. Zenaiev
- Deutsches Elektronen-Synchrotron DESY
- DOI
- https://doi.org/10.1007/JHEP04(2020)070
- Journal volume & issue
-
Vol. 2020,
no. 4
pp. 1 – 52
Abstract
Abstract Two-particle azimuthal correlations have been measured in neutral current deep inelastic ep scattering with virtuality Q 2 > 5 GeV2 at a centre-of-mass energy s $$ \sqrt{s} $$ = 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 < p T < 5.0 GeV and event multiplicities N ch up to six times larger than the average 〈N ch〉 ≈ 5. The two-particle correlations have been measured in terms of the angular observables c n{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.
Keywords
- Collective flow
- Lepton-Nucleon Scattering (experiments)
- Particle correlations and fluctuations
- Quark gluon plasma
