Azimuthal correlations in photoproduction and deep inelastic $\boldsymbol{ep}$ scattering at HERA
Abstract
Collective behaviour of final-state hadrons, and multiparton interactions are studied in high-multiplicity scattering at a centre-of-mass energy 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 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.
Keywords
Cite
@article{arxiv.2106.12377,
title = {Azimuthal correlations in photoproduction and deep inelastic $\boldsymbol{ep}$ scattering at HERA},
author = {ZEUS collaboration and I. Abt and R. Aggarwal and V. Aushev and O. Behnke and A. Bertolin and I. Bloch and I. Brock and N. H. Brook and R. Brugnera and A. Bruni and P. J. Bussey and A. Caldwell and C. D. Catterall and J. Chwastowski and J. Ciborowski and R. Ciesielski and A. M. Cooper-Sarkar and M. Corradi and R. K. Dementiev and S. Dusini and J. Ferrando and S. Floerchinger and B. Foster and E. Gallo and D. Gangadharan and A. Garfagnini and A. Geiser and L. K. Gladilin and Y. A. Golubkov and G. Grzelak and C. Gwenlan and D. Hochman and N. Z. Jomhari and I. Kadenko and U. Karshon and P. Kaur and R. Klanner and U. Klein and I. A. Korzhavina and N. Kovalchuk and M. Kuze and B. B. Levchenko and A. Levy and B. Löhr and E. Lohrmann and A. Longhin and F. Lorkowski and O. Y. Lukina and I. Makarenko and J. Malka and S. Masciocchi and K. Nagano and J. D. Nam and J. Onderwaater and Y. Onishchuk and E. Paul and I. Pidhurskyi and A. Polini and M. Przybycien and A. Quintero and M. Ruspa and U. Schneekloth and T. Schörner-Sadenius and I. Selyuzhenkov and M. Shchedrolosiev and L. M. Shcheglova and I. O. Skillicorn and W. Słomiński and A. Solano and L. Stanco and N. Stefaniuk and B. Surrow and K. Tokushuku and O. Turkot and T. Tymieniecka and A. Verbytskyi and W. A. T. Wan Abdullah and K. Wichmann and M. Wing and S. Yamada and Y. Yamazaki and A. F. Zarnecki and O. Zenaiev},
journal= {arXiv preprint arXiv:2106.12377},
year = {2022}
}
Comments
27 pages, 9 figures. Additional material included as an ancillary file for this arXiv entry