Characterizing the initial conditions of heavy-ion collisions at the LHC with mean transverse momentum and anisotropic flow correlations



Acharya, S, Adamova, D, Adler, A, Adolfsson, J, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU
et al (show 1006 more authors) (2022) Characterizing the initial conditions of heavy-ion collisions at the LHC with mean transverse momentum and anisotropic flow correlations PHYSICS LETTERS B, 834. 137393-. ISSN 0370-2693, 1873-2445

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Abstract

Correlations between mean transverse momentum [p<inf>T</inf>] and anisotropic flow coefficients v<inf>2</inf> or v<inf>3</inf> are measured as a function of centrality in Pb–Pb and Xe–Xe collisions at s<inf>NN</inf>=5.02 TeV and 5.44 TeV, respectively, with ALICE. In addition, the recently proposed higher-order correlation between [p<inf>T</inf>], v<inf>2</inf>, and v<inf>3</inf> is measured for the first time, which shows an anticorrelation for the presented centrality ranges. These measurements are compared with hydrodynamic calculations using IP-Glasma and T<inf>R</inf>ENTo initial-state shapes, the former based on the Color Glass Condensate effective theory with gluon saturation, and the latter a parameterized model with nucleons as the relevant degrees of freedom. The data are better described by the IP-Glasma rather than the T<inf>R</inf>ENTo based calculations. In particular, Trajectum and JETSCAPE predictions, both based on the T<inf>R</inf>ENTo initial state model but with different parameter settings, fail to describe the measurements. As the correlations between [p<inf>T</inf>] and v<inf>n</inf> are mainly driven by the correlations of the size and the shape of the system in the initial state, these new studies pave a novel way to characterize the initial state and help pin down the uncertainty of the extracted properties of the quark–gluon plasma recreated in relativistic heavy-ion collisions.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Divisions: Faculty of Science & Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 04 May 2023 10:45
Last Modified: 22 May 2026 15:02
DOI: 10.1016/j.physletb.2022.137393
Open Access URL: https://doi.org/10.1016/j.physletb.2022.137393
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3170163
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