Bonn 2020 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 36: Heavy-Ion Collisions and QCD Phases IX
HK 36.1: Group Report
Wednesday, April 1, 2020, 16:30–17:00, J-HS H
Two-particle azimuthal correlations as a probe of collective behaviour in deep inelastic ep scattering at HERA — •Dhevan Gangadharan for the ZEUS collaboration — Universitat Heidelberg, Heidelberg, Deutschland
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 and transverse momentum 0.1 < pT < 5 GeV and event multiplicities Nch up to six times larger than the average < Nch >=5. The two-particle correlations are measured in terms of the angular observables cn{n}=< < cos n(ϕ1 − ϕ2) > >, where the harmonic n is between 1 and 4 and ϕi is the azimuthal angle of particle i. The correlations observed in HERA data do not indicate the kind of collective behaviour as recently observed at the highest RHIC and LHC energies in high multiplicity hadronic collisions. Available Monte Carlo models of deep inelastic scattering, tuned to reproduce the inclusive particle production, provide a qualitative description of the HERA data.