학술논문
Azimuthal correlations in photoproduction and deep inelastic $\boldsymbol{ep}$ scattering at HERA
Document Type
Working Paper
Author
ZEUS collaboration; Abt, I.; Aggarwal, R.; Aushev, V.; Behnke, O.; Bertolin, A.; Bloch, I.; Brock, I.; Brook, N. H.; Brugnera, R.; Bruni, A.; Bussey, P. J.; Caldwell, A.; Catterall, C. D.; Chwastowski, J.; Ciborowski, J.; Ciesielski, R.; Cooper-Sarkar, A. M.; Corradi, M.; Dementiev, R. K.; Dusini, S.; Ferrando, J.; Floerchinger, S.; Foster, B.; Gallo, E.; Gangadharan, D.; Garfagnini, A.; Geiser, A.; Gladilin, L. K.; Golubkov, Y. A.; Grzelak, G.; Gwenlan, C.; Hochman, D.; Jomhari, N. Z.; Kadenko, I.; Karshon, U.; Kaur, P.; Klanner, R.; Klein, U.; Korzhavina, I. A.; Kovalchuk, N.; Kuze, M.; Levchenko, B. B.; Levy, A.; Löhr, B.; Lohrmann, E.; Longhin, A.; Lorkowski, F.; Lukina, O. Y.; Makarenko, I.; Malka, J.; Masciocchi, S.; Nagano, K.; Nam, J. D.; Onderwaater, J.; Onishchuk, Y.; Paul, E.; Pidhurskyi, I.; Polini, A.; Przybycien, M.; Quintero, A.; Ruspa, M.; Schneekloth, U.; Schörner-Sadenius, T.; Selyuzhenkov, I.; Shchedrolosiev, M.; Shcheglova, L. M.; Skillicorn, I. O.; Słomiński, W.; Solano, A.; Stanco, L.; Stefaniuk, N.; Surrow, B.; Tokushuku, K.; Turkot, O.; Tymieniecka, T.; Verbytskyi, A.; Abdullah, W. A. T. Wan; Wichmann, K.; Wing, M.; Yamada, S.; Yamazaki, Y.; Zarnecki, A. F.; Zenaiev, O.
Source
Subject
Language
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.
Comment: 27 pages, 9 figures. Additional material included as an ancillary file for this arXiv entry
Comment: 27 pages, 9 figures. Additional material included as an ancillary file for this arXiv entry