Two-particle azimuthal correlations as a probe of collective behaviour in deep inelastic $\text{ep}$ scattering at HERA

Abstract

Two-particle azimuthal correlations have been measured in neutral current deep $\mbox{inelastic}$ $\text{ep}$ scattering with virtuality $Q^2>5$ GeV${}^2$ at a centre-of-mass energy $\sqrt{s}=318$ GeV recorded with the ZEUS detector at HERA. The correlations of charged particles have been measured in the range of laboratory pseudorapidity $-1.5<\eta <2.0$ and transverse momentum $0.1<p_{\text{T}}<5.0$ GeV and event multiplicities $N_{\text{ch}}$ up to six times larger than the average $⟨N_{\text{ch}}⟩\approx 5$. The two-particle correlations have been measured in terms of the angular observables $c_n\{2\}=⟨⟨\cos n\Delta \phi ⟩⟩$, where $n$ is between 1 and 4 and $\Delta \phi$ is the relative azimuthal angle between the two particles. Comparisons with available models of deep inelastic scattering, which are tuned to reproduce inclusive particle production, suggest that the measured two-particle correlations are dominated by contributions from multijet production. The correlations observed here do not indicate the kind of collective behaviour recently observed at the highest RHIC and LHC energies in high-multiplicity hadronic collisions.

Updated draft after JHEP review. Fix plotting mistake in figures 3-5

References in corpus (2)

• The ridge in proton-proton collisions at the LHC
• Correlations from hydrodynamic flow in p-Pb collisions

Cited by in corpus (21)

• The Large Hadron-Electron Collider at the HL-LHC
• Heavy quarks and jets as probes of the QGP
• The Present and Future of QCD
• Two-particle azimuthal correlations in photonuclear ultraperipheral Pb+Pb collisions at 5.02 TeV with ATLAS
• Studies of charm and beauty hadron long-range correlations in pp and pPb collisions at LHC energies
• Overview of high-density QCD studies with the CMS experiment at the LHC
• Novel observables for exploring QCD collective evolution and quantum entanglement within individual jets
• Multi-particle production in proton-nucleus collisions in the Color Glass Condensate
• The Potential of a TeV-Scale Muon-Ion Collider
• Two-particle azimuthal correlations in $\gamma$p interactions using pPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV
• Observation of enhanced long-range elliptic anisotropies inside high-multiplicity jets in pp collisions at $\sqrt{s}$ = 13 TeV
• Exploring the Collective Phenomenon at the Electron-Ion Collider
• Azimuthal correlations in photoproduction and deep inelastic $\mathbf{ep}$ scattering at HERA
• An Experiment for Electron-Hadron Scattering at the LHC
• Measurement of Two-Particle Correlations of Hadrons in $e^{+}{e}^{-}$ Collisions at Belle
• "QM19 summary talk": Outlook and future of heavy-ion collisions
• Observation of the Singly Cabibbo-Suppressed Decay ${\Lambda }_c^{+}\to p{\pi }^0$
• CGC for Ultra-Peripheral Pb+Pb Collisions at the Large Hadron Collider: a more realistic calculation
• Connection between soft and hard probes of small collision systems at RHIC and LHC
• Impact of soft QCD effects over intrajet azimuthal anisotropies
• Perfect QCD -- a new Universal approach to soft QCD