{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.153671.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2806288"}},{"@id":"https://doi.org/10.1103/PhysRevLett.133.252301","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2025","description":"High-energy nuclear collisions create a quark-gluon plasma, whose initial condition and subsequent expansion vary from event to event, impacting the distribution of the event-wise average transverse momentum ($P([p_{\\mathrm{T}}])$). Distinguishing between contributions from fluctuations in the size of the nuclear overlap area (geometrical component) and other sources at fixed size (intrinsic component) presents a challenge. Here, these two components are distinguished by measuring the mean, variance, and skewness of $P([p_{\\mathrm{T}}])$ in $^{208}$Pb+$^{208}$Pb and $^{129}$Xe+$^{129}$Xe collisions at $\\sqrt{s_{{\\mathrm{NN}}}} = 5.02$ and 5.44 TeV, respectively, using the ATLAS detector at the LHC. All observables show distinct changes in behavior in ultra-central collisions, where the geometrical variations are suppressed as the overlap area reaches its maximum. These results demonstrate a new technique to disentangle geometrical and intrinsic fluctuations, enabling constraints on initial condition and properties of the quark-gluon plasma, such as the speed of sound.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.153671.v1/t1","@type":"Dataset","description":"Data from Figure 1, panel a, $\\left\\langle[p_{T}]\\right\\rangle$ vs $N_{ch}$ for Pb+Pb collisions, 0.5 $ <p_{T}< $ 5 GeV/c, $|\\eta|< $...","name":"Figure 1a"},{"@id":"https://doi.org/10.17182/hepdata.153671.v1/t2","@type":"Dataset","description":"Data from Figure 1, panel b, $\\left\\langle[p_{T}]\\right\\rangle$ vs $N_{ch}$ for Pb+Pb collisions, 0.5 $ <p_{T}< $ 5 GeV/c, $|\\eta|< $...","name":"Figure 1b_Pb"},{"@id":"https://doi.org/10.17182/hepdata.153671.v1/t3","@type":"Dataset","description":"Data from Figure 1, panel b, $\\left\\langle[p_{T}]\\right\\rangle$ vs $N_{ch}$ for Xe+Xe collisions, 0.5 $ <p_{T}< $ 5 GeV/c, $|\\eta|< $...","name":"Figure 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