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Fluctuations of anisotropic flow in Pb+ Pb collisions at √s.sub.NN./sub. = 5.02 TeV with the ATLAS detector

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    0537160 - FZÚ 2021 RIV US eng J - Journal Article
    Aaboud, M. - Aad, G. - Abbott, B. - Chudoba, Jiří - Hejbal, Jiří - Hladík, Ondřej - Jačka, Petr - Jakoubek, Tomáš - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2930 authors
    Fluctuations of anisotropic flow in Pb+ Pb collisions at √sNN = 5.02 TeV with the ATLAS detector.
    Journal of High Energy Physics. Roč. 2020, č. 1 (2020), s. 1-59, č. článku 51. ISSN 1029-8479. E-ISSN 1029-8479
    R&D Projects: GA MŠMT(CZ) LTT17018
    Research Infrastructure: CERN-CZ II - 90104
    Institutional support: RVO:68378271
    Keywords : ATLAS * CERN * LHC * heavy-ion collision * Hadron-Hadron scattering (experiments) * collective flow
    OECD category: Particles and field physics
    Impact factor: 5.810, year: 2020
    Method of publishing: Open access

    Multi-particle azimuthal cumulants are measured as a function of centrality and transverse momentum using 470 μb−1^{−1}−1 of Pb+Pb collisions at sNN sqrt{s_{mathrm{NN}}} sNN​ ​ = 5.02 TeV with the ATLAS detector at the LHC. These cumulants provide information on the event-by-event fluctuations of harmonic flow coefficients vn_{n}n​ and correlated fluctuations between two harmonics vn_{n}n​ and vm_{m}m​. For the first time, a non-zero four-particle cumulant is observed for dipolar flow, v1_{1}1​. The four-particle cumulants for elliptic flow, v2_{2}2​, and triangular flow, v3_{3}3​, exhibit a strong centrality dependence and change sign in ultra-central collisions. This sign change is consistent with significant non-Gaussian fluctuations in v2_{2}2​ and v3_{3}3​. The four-particle cumulant for quadrangular flow, v4_{4}4​, is found to change sign in mid-central collisions.
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