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Article
Report number arXiv:2106.12377 ; DESY-21-099
Title Azimuthal correlations in photoproduction and deep inelastic $ep$ scattering at HERA
Author(s)

Abt, I. (Munich, Max Planck Inst.) ; Aggarwal, R. (Unlisted) ; Aushev, V. (Taras Shevchenko U.) ; Behnke, O. (DESY) ; Bertolin, A. (INFN, Padua) ; Bloch, I. (DESY, Zeuthen) ; Brock, I. (Bonn U.) ; Brook, N.H. (University Coll. London ; Bath U.) ; Brugnera, R. (INFN, Padua ; Padua U.) ; Bruni, A. (INFN, Bologna ; U. Bologna, DIFA) ; Bussey, P.J. (Glasgow U.) ; Caldwell, A. (Munich, Max Planck Inst.) ; Catterall, C.D. (York U., Canada) ; Chwastowski, J. (Cracow, INP) ; Ciborowski, J. (Warsaw U. ; Lodz U.) ; Ciesielski, R. (DESY ; Rockefeller U.) ; Cooper-Sarkar, A.M. (Oxford U.) ; Corradi, M. (INFN, Bologna ; U. Bologna, DIFA ; INFN, Rome) ; Dementiev, R.K. (SINP, Moscow ; Dubna, JINR) ; Dusini, S. (INFN, Padua) ; Ferrando, J. (DESY) ; Floerchinger, S. (U. Heidelberg, ITP) ; Foster, B. (Oxford U. ; Trieste U. ; Frascati ; Hamburg U. ; DESY) ; Gallo, E. (Hamburg U. ; DESY) ; Gangadharan, D. (Heidelberg U. ; Houston U.) ; Garfagnini, A. (INFN, Padua ; Padua U.) ; Geiser, A. (DESY) ; Gladilin, L.K. (SINP, Moscow ; Dubna, JINR) ; Golubkov, Yu. A. (SINP, Moscow ; Dubna, JINR) ; Grzelak, G. (Warsaw U.) ; Gwenlan, C. (Oxford U.) ; Hochman, D. (Weizmann Inst.) ; Jomhari, N.Z. (DESY) ; Kadenko, I. (Taras Shevchenko U.) ; Karshon, U. (Weizmann Inst.) ; Kaur, P. (SLIET, Longowal) ; Klanner, R. (Hamburg U.) ; Klein, U. (DESY ; Daresbury) ; Korzhavina, I.A. (SINP, Moscow ; Dubna, JINR) ; Kovalchuk, N. (Hamburg U.) ; Kuze, M. (Tokyo Inst. Tech.) ; Levchenko, B.B. (SINP, Moscow ; Dubna, JINR) ; Levy, A. (Tel Aviv U.) ; Löhr, B. (DESY) ; Lohrmann, E. (Hamburg U.) ; Longhin, A. (INFN, Padua ; Padua U.) ; Lorkowski, F. (DESY) ; Lukina, O.Yu. (SINP, Moscow ; Dubna, JINR) ; Makarenko, I. (DESY) ; Malka, J. (DESY ; Hamburg U.) ; Masciocchi, S. (Darmstadt, GSI ; Heidelberg U.) ; Nagano, K. (KEK, Tsukuba) ; Nam, J.D. (Temple U.) ; Onderwaater, J. (Heidelberg U. ; Darmstadt, Tech. U. ; CERN) ; Onishchuk, Yu. (Taras Shevchenko U.) ; Paul, E. (Bonn U.) ; Pidhurskyi, I. (Frankfurt U., Inst. Kernphys.) ; Polini, A. (INFN, Bologna ; U. Bologna, DIFA) ; Przybycień, M. (AGH-UST, Cracow) ; Quintero, A. (Temple U.) ; Ruspa, M. (Piemonte Orientale U., Alessandria) ; Schneekloth, U. (DESY) ; Schörner-Sadenius, T. (DESY) ; Selyuzhenkov, I. (Darmstadt, GSI) ; Shchedrolosiev, M. (DESY) ; Shcheglova, L.M. (SINP, Moscow ; Dubna, JINR) ; Skillicorn, I.O. (Glasgow U.) ; Słomiński, W. (Jagiellonian U.) ; Solano, A. (INFN, Turin ; Turin U.) ; Stanco, L. (INFN, Padua) ; Stefaniuk, N. (DESY) ; Surrow, B. (Temple U.) ; Tokushuku, K. (KEK, Tsukuba) ; Turkot, O. (DESY ; Hamburg U.) ; Tymieniecka, T. (Warsaw, Inst. Nucl. Studies) ; Verbytskyi, A. (Munich, Max Planck Inst.) ; Wan Abdullah, W.A. T. (Malaya U.) ; Wichmann, K. (DESY) ; Wing, M. (University Coll. London ; DESY) ; Yamada, S. (KEK, Tsukuba) ; Yamazaki, Y. (Kobe U.) ; Żarnecki, A.F. (Warsaw U.) ; Zenaiev, O. (DESY ; CERN)

Publication 2021-12-16
Imprint 2021-06-23
Number of pages 27
Note 27 pages, 9 figures. Additional material included as an ancillary file for this arXiv entry
In: JHEP 2112 (2021) 102
DOI 10.1007/JHEP12(2021)102
Subject category nucl-ex ; Nuclear Physics - Experiment ; hep-ex ; Particle Physics - Experiment
Accelerator/Facility, Experiment DESY HERA ; ZEUS
Abstract Collective behaviour of final-state hadrons, and multiparton interactions are studied in high-multiplicity $ep$ scattering at a centre-of-mass energy $\sqrt{s}=318$ GeV with the ZEUS detector at HERA. Two- and four-particle azimuthal correlations, as well as multiplicity, transverse momentum, and pseudorapidity distributions for charged-particle multiplicities $N_{\textrm ch} \geq 20$ are measured. The dependence of two-particle correlations on the virtuality of the exchanged photon shows a clear transition from photoproduction to neutral current deep inelastic scattering. For the multiplicities studied, neither the measurements in photoproduction processes nor those in neutral current deep inelastic scattering indicate significant collective behaviour of the kind observed in high-multiplicity hadronic collisions at RHIC and the LHC. Comparisons of PYTHIA predictions with the measurements in photoproduction strongly indicate the presence of multiparton interactions from hadronic fluctuations of the exchanged photon.
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