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| Journal Article | GSI-2022-00184 |
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2021
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Please use a persistent id in citations: doi:10.1007/JHEP12(2021)102 doi:10.15120/GSI-2022-00184
Report No.: DESY-21-099; arXiv:2106.12377
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$_{ch}$ ≥ 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.
Keyword(s): electron p: deep inelastic scattering ; positron p: deep inelastic scattering ; deep inelastic scattering: neutral current ; hadron: final state ; fluctuation: hadronic ; correlation: two-particle ; charged particle: multiplicity ; charged particle: correlation ; hadron hadron: interaction ; photoproduction ; photon ; angular distribution: anisotropy ; angular correlation: two-particle ; collective phenomena ; transverse momentum dependence ; rapidity dependence ; multiplicity: dependence ; cumulant expansion ; DESY HERA Stor ; ZEUS ; charged particle: transverse momentum ; CERN LHC Coll ; Brookhaven RHIC Coll ; PYTHIA ; elliptic flow ; charged particle: rapidity ; numerical calculations: Monte Carlo ; experimental results ; 318 GeV-cms ; Collective flow ; Lepton-Nucleon Scattering (experiments) ; Particle correlations and fluctuations ; Quark gluon plasma
- ddc:530
Note: 27 pages, 9 figures. Additional material included as an ancillary file for this arXiv entry SCOAP3 ccby4.0 HERA: ZEUS EXP:(DE-588)4276505-5
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Appears in the scientific report 2021
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