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

CERN-LHC. Multi-particle cumulants and corresponding Fourier harmonics are measured for azimuthal angle distributions of charged particles in pp collisions at $\sqrt{s}$ = 5.02 and 13 TeV and in p+Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV, and compared to the results obtained for low-multiplicity Pb+Pb collisions at $\sqrt{s_{NN}}$ = 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 p+Pb and low-multiplicity Pb+Pb collisions. On the other hand, the pp 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+Pb, smaller in p+Pb and smallest in pp collisions. The pp results show no dependence on the collision energy, nor on the multiplicity.

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Field Value
Imported on November 17, 2025
Last update November 17, 2025
Keywords
  • cmenergies: 5020.0-5020.0
  • observables: CORR
  • Inclusive
  • Proton-Proton Scattering
  • Pb Pb --> CHARGED X
  • P P --> CHARGED X
  • P Pb --> CHARGED X
Defined In https://doi.org/10.1140/epjc/s10052-017-4988-1
Author Morad Aaboud
More Authors
Georges Aad
Brad Abbott
Jalal Abdallah
Ovsat Abdinov
Baptiste Abeloos
Syed Haider Abidi
Ossama AbouZeid
Nicola Abraham
Halina Abramowicz
Repository Name INSPIRE-HEP
Source Creation February 17, 2025
Source Modified March 26, 2025
Language Deutsch
Publication Year 2017-06-21