Two-particle azimuthal correlations as a probe of collective behaviour in deep inelastic <i>ep</i> scattering at HERA



Abt, I, Adamczyk, L, Aggarwal, R, Aushev, V, Behnke, O, Behrens, U, Bertolin, A, Bloch, I, Brock, I, Brook, NH
et al (show 84 more authors) (2020) Two-particle azimuthal correlations as a probe of collective behaviour in deep inelastic <i>ep</i> scattering at HERA. JOURNAL OF HIGH ENERGY PHYSICS, 2020 (4). 70-.

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Abstract

Two-particle azimuthal correlations have been measured in neutral current deep inelastic ep scattering with virtuality Q2> 5 GeV2 at a centre-of-mass energy 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 < η < 2.0 and transverse momentum 0.1 < pT< 5.0 GeV and event multiplicities Nch up to six times larger than the average 〈Nch〉 ≈ 5. The two-particle correlations have been measured in terms of the angular observables cn{2} = 〈〈cosnΔφ〉〉, where n is between 1 and 4 and ∆φ 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.

Item Type: Article
Uncontrolled Keywords: Collective flow, Lepton-Nucleon Scattering (experiments), Particle correlations and fluctuations, Quark gluon plasma
Depositing User: Symplectic Admin
Date Deposited: 17 Nov 2020 10:49
Last Modified: 15 Mar 2024 09:29
DOI: 10.1007/JHEP04(2020)070
Open Access URL: https://link.springer.com/article/10.1007/JHEP04(2...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3107236