ATLAS, CollaborationCollaborationATLASAgustoni, MarcoMarcoAgustoniAncu, LucianLucianAncuBattaglia, AndreasAndreasBattagliaBeck, Hans PeterHans PeterBeck0000-0001-7212-1096Borer, ClaudiaClaudiaBorerCervelli, AlbertoAlbertoCervelliEreditato, AntonioAntonioEreditatoGallo, ValentinaValentinaGalloHaug, SigveSigveHaug0000-0003-0442-3361Kabana, SonjaSonjaKabanaKruker, TobiasTobiasKrukerMarti, LukasLukasMartiPretzl, Klaus-PeterKlaus-PeterPretzlSchneider, BasilBasilSchneiderSciacca, GianfrancoGianfrancoSciaccaWeber, MichaelMichaelWeber0000-0002-2770-90312024-10-232024-10-232013https://boris-portal.unibe.ch/handle/20.500.12422/126286The distributions of event-by-event harmonic flow coefficients v_n for n=2-4 are measured in sqrt(s_NN)=2.76 TeV Pb+Pb collisions using the ATLAS detector at the LHC. The measurements are performed using charged particles with transverse momentum pT> 0.5 GeV and in the pseudorapidity range |eta|<2.5 in a dataset of approximately 7 ub^-1 recorded in 2010. The shapes of the v_n distributions are described by a two-dimensional Gaussian function for the underlying flow vector in central collisions for v_2 and over most of the measured centrality range for v_3 and v_4. Significant deviations from this function are observed for v_2 in mid-central and peripheral collisions, and a small deviation is observed for v_3 in mid-central collisions. It is shown that the commonly used multi-particle cumulants are insensitive to the deviations for v_2. The v_n distributions are also measured independently for charged particles with 0.5<pT<1 GeV and pT>1 GeV. When these distributions are rescaled to the same mean values, the adjusted shapes are found to be nearly the same for these two pT ranges. The v_n distributions are compared with the eccentricity distributions from two models for the initial collision geometry: a Glauber model and a model that includes corrections to the initial geometry due to gluon saturation effects. Both models fail to describe the experimental data consistently over most of the measured centrality range.en500 - Science::530 - Physicsarticle10.7892/boris.583931305.2942v200032833240000110.1007/JHEP11(2013)183