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Measurement of the azimuthal anisotropy of charged particles in √sNN=5.36 TeV 16O+16O and 20Ne+20Ne collisions with the ATLAS detector
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Measurement of the azimuthal anisotropy of charged particles in √sNN=5.36 TeV 16O+16O and 20Ne+20Ne collisions with the ATLAS detector

G. Aad, E. Aakvaag, B. Abbott, S. Abdelhameed, K. Abeling, N. J. Abicht, S. H. Abidi, M. Aboelela, A. Aboulhorma, H. Abramowicz, …
Physical review. C, 卷.113(4), 045205
13/04/2026
Web of Science ID: WOS:001772278200001

摘要

Physical Sciences Physics Physics, Nuclear Science & Technology
This paper presents the first measurements of the azimuthal anisotropy coefficients vn, which quantify the nth-order Fourier modulation of charged-particle azimuthal distributions, for n = 2-4 in root s(NN) = 5.36 TeV O-16+ O-16 and Ne-20+ Ne-20 collisions recorded with the ATLAS detector at the CERN Large Hadron Collider in 2025. The v(n) coefficients are measured as a function of transverse momentum (p(T)), collision centrality, and event multiplicity. They are extracted using two complementary methods: two-particle correlations with a template-fit subtraction of short-range nonflow contributions, and four-particle subevent cumulants, which intrinsically suppress nonflow effects and provide sensitivity to flow fluctuations. The results show a clear hierarchy v(2) > v(3) > v(4) and a nonmonotonic dependence on p(T), reaching a maximum around 2 GeV, consistent with trends observed in heavy-ion collisions. Detailed comparisons between the two collision systems reveal an enhanced v(2) in central Ne-20+ Ne-20 collisions, consistent with theory expectations based on the predicted prolate deformation of neon nuclei, in contrast to the slightly tetrahedral structure predicted for oxygen. The four-particle cumulant results highlight strong event-by-event fluctuations and provide the greatest sensitivity to nuclear shape effects. These measurements can place new constraints on the initial geometry and the hydrodynamic response in light-ion collisions, offering valuable input for models of nuclear structure.

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https://doi.org/10.1103/xqxz-8bhf檢視
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