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Measurement of multi-particle azimuthal correlations in pp, p plus Pb and low-multiplicity Pb plus Pb collisions with the ATLAS detector

Aaboud, M; Aad, G; Abbott, B; Abdallah, J; Abdinov, O; Abeloos, B; Abidi, SH; ... Zwalinski, L; + view all (2017) Measurement of multi-particle azimuthal correlations in pp, p plus Pb and low-multiplicity Pb plus Pb collisions with the ATLAS detector. The European Physical Journal C , 77 (6) , Article 428. 10.1140/epjc/s10052-017-4988-1. Green open access

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Abstract

Multi-particle cumulants and corresponding Fourier harmonics are measured for azimuthal angle distributions of charged particles in pppp collisions at s√s = 5.02 and 13 TeV and in pp + Pb collisions at sNN−−−√sNN = 5.02 TeV, and compared to the results obtained for low-multiplicity Pb + PbPb + Pb collisions at sNN−−−√sNN = 2.76 TeV. These measurements aim to assess the collective nature of particle production. The measurements of multi-particle cumulants confirm the evidence for collective phenomena in pp + Pb and low-multiplicity Pb + PbPb + Pb collisions. On the other hand, the pppp results for four-particle cumulants do not demonstrate collective behaviour, indicating that they may be biased by contributions from non-flow correlations. A comparison of multi-particle cumulants and derived Fourier harmonics across different collision systems is presented as a function of the charged-particle multiplicity. For a given multiplicity, the measured Fourier harmonics are largest in Pb + PbPb + Pb , smaller in pp + Pb and smallest in pppp collisions. The pppp results show no dependence on the collision energy, nor on the multiplicity.

Type: Article
Title: Measurement of multi-particle azimuthal correlations in pp, p plus Pb and low-multiplicity Pb plus Pb collisions with the ATLAS detector
Open access status: An open access version is available from UCL Discovery
DOI: 10.1140/epjc/s10052-017-4988-1
Publisher version: http://dx.doi.org/10.1140/epjc/s10052-017-4988-1
Language: English
Additional information: © CERN for the benefit of the ATLAS collaboration 2017. This article is an open access publication
Keywords: Science & Technology, Physical Sciences, Physics, Particles & Fields, Physics, Nucleus-Nucleus Collisions, Quark-Gluon Plasma, Angular-Correlations, Root-S(Nn)=2.76 Tev, Anisotropic Flow, Collective Flow, Proton-Nucleus, Ion Collisions, Eccentricities, Collaboration
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-pp.ucl.ac.uk/id/eprint/1561598
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