Correlations and fluctuations of flow with event shape engineering in Pb-Pb and Xe-Xe collisions at the LHC
Abstract
Measurements of anisotropic flow provide some of the strongest constraints on the collective expansion and transport properties of the quark-gluon plasma produced in ultra-relativistic heavy-ion collisions. In this paper, correlations and fluctuations of the anisotropic flow coefficients v2, v3, and v4 are measured in Pb-Pb and Xe-Xe collisions at √(sNN) = 5.02 and $5.44$ TeV, respectively, with the ALICE detector. The Event Shape Engineering technique, based on the reduced flow vector qn, is used to study flow correlations for different initial-state geometries. A strong anticorrelation between v2 and v3 and a positive correlation between v2 and v4 are observed. A small anticorrelation is seen between v3 and v4. From the v2-v4 correlation, the linear and nonlinear components of v4 are extracted and compared to those extracted using multiparticle correlations. The linear and nonlinear components of v4 are also measured directly as a function of q2 for the first time in Pb-Pb and Xe-Xe, revealing a strong coupling of the nonlinear term to the initial-state ellipticity ε2, while the linear component shows little dependence on initial-state geometry. Additionally, the coupling coefficient χ4,22, which measures the nonlinear contribution of v22 to v4, is extracted and shows little dependence on q2, except in very central collisions. The effects of flow fluctuations for constrained initial-state geometries are studied for the first time using Event Shape Engineering with the ratio of v2{2} and v2{4}; the results show that collisions with the lowest q2 exhibit more significant v2 fluctuations compared to the unbiased ratio.
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BibTeX
@misc{collaboration2026correlations,
title = {{Correlations and fluctuations of flow with event shape engineering in Pb-Pb and Xe-Xe collisions at the LHC}},
author = {ALICE Collaboration},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.08473},
eprint = {2611.08473},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.08473},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Correlations and fluctuations of flow with event shape engineering in Pb-Pb and Xe-Xe collisions at the LHC
AU - ALICE Collaboration
PY - 2026
DA - 2026/11/05
PB - arXiv
DO - 10.48550/arxiv.2611.08473
UR - https://arxiv.org/abs/2611.08473
AB - Measurements of anisotropic flow provide some of the strongest constraints on the collective expansion and transport properties of the quark-gluon plasma produced in ultra-relativistic heavy-ion collisions. In this paper, correlations and fluctuations of the anisotropic flow coefficients v_2, v_3, and v_4 are measured in Pb-Pb and Xe-Xe collisions at √(s_NN) = 5.02 and $5.44$ TeV, respectively, with the ALICE detector. The Event Shape Engineering technique, based on the reduced flow vector q_n, is used to study flow correlations for different initial-state geometries. A strong anticorrelation between v_2 and v_3 and a positive correlation between v_2 and v_4 are observed. A small anticorrelation is seen between v_3 and v_4. From the v_2-v_4 correlation, the linear and nonlinear components of v_4 are extracted and compared to those extracted using multiparticle correlations. The linear and nonlinear components of v_4 are also measured directly as a function of q_2 for the first time in Pb-Pb and Xe-Xe, revealing a strong coupling of the nonlinear term to the initial-state ellipticity ε_2, while the linear component shows little dependence on initial-state geometry. Additionally, the coupling coefficient χ_4,22, which measures the nonlinear contribution of v_2^2 to v_4, is extracted and shows little dependence on q_2, except in very central collisions. The effects of flow fluctuations for constrained initial-state geometries are studied for the first time using Event Shape Engineering with the ratio of v_2{2} and v_2{4}; the results show that collisions with the lowest q_2 exhibit more significant v_2 fluctuations compared to the unbiased ratio.
ER -