Measurement of multi-particle azimuthal correlations in \(pp\), \(p\)+Pb and low-multiplicity Pb+Pb collisions with the ATLAS detector
Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste; Abidi, Syed Haider; AbouZeid, Hass; Abraham, Nadine L.; Abramowicz, Halina; Buanes, Trygve; Dale, Ørjan; Eigen, Gerald; Liebig, Wolfgang; Lipniacka, Anna; Martin dit Latour, Bertrand; Mæland, Steffen; Stugu, Bjarne; Yang, Zongchang; Zalieckas, Justas; Bugge, Magnar Kopangen; Cameron, David Gordon; Catmore, James Richard; Feigl, Simon; Franconi, Laura; Garonne, Vincent; Gjelsten, Børge Kile; Gramstad, Eirik; Morisbak, Vanja; Nilsen, Jon Kerr; Ould-Saada, Farid; Raddum, Silje Hattrem; Read, Alexander Lincoln; Røhne, Ole Myren; Sandaker, Heidi; Serfon, Cédric; Stapnes, Steinar; Strandlie, Are; Abreu, Henso; Abreu, Rômulo F.; Abulaiti, Yiming; Acharya, Bobby S.; Adachi, Shunsuke; Adamczyk, Leszek; Adelman, Jareed; Adersberger, Michael; Adye, Tim; Affolder, Anthony Allen; Agatonovic-Jovin, Tatjana; Agheorghiesei, Catalin; ATLAS, Collaboration
Peer reviewed, Journal article
Published version
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https://hdl.handle.net/1956/18367Utgivelsesdato
2017-06Metadata
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Originalversjon
https://doi.org/10.1140/epjc/s10052-017-4988-1Sammendrag
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.