The ZEUS collaboration;
Abt, I;
Aggarwal, R;
Aushev, V;
Behnke, O;
Bertolin, A;
Bloch, I;
... Zenaiev, O; + view all
(2021)
Azimuthal correlations in photoproduction and deep inelastic ep scattering at HERA.
Journal of High Energy Physics
, 2021
, Article 102. 10.1007/JHEP12(2021)102.
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Abstract
Collective behaviour of final-state hadrons, and multiparton interactions are studied in high-multiplicity ep scattering at a centre-of-mass energy 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 Nch ≥ 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.
| Type: | Article |
|---|---|
| Title: | Azimuthal correlations in photoproduction and deep inelastic ep scattering at HERA |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1007/JHEP12(2021)102 |
| Publisher version: | https://doi.org/10.1007/JHEP12(2021)102 |
| Language: | English |
| Additional information: | This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0) (http://creativecommons.org/licenses/by/4.0/), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. |
| Keywords: | Collective flow, Lepton-Nucleon Scattering (experiments), Particle correlations and fluctuations, Quark gluon plasma |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10141263 |
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