Evidence for the Collective Nature of Radial Flow in Pb plus Pb Collisions with the ATLAS Detector



Aad, G, Aakvaag, E, Abbott, B, Abdelhameed, S, Abeling, K, Abicht, NJ, Abidi, SH, Aboelela, M, Aboulhorma, A, Abramowicz, H
et al (show 2870 more authors) (2026) Evidence for the Collective Nature of Radial Flow in Pb plus Pb Collisions with the ATLAS Detector PHYSICAL REVIEW LETTERS, 136 (3). 032301-. ISSN 0031-9007, 1079-7114

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Abstract

Anisotropic flow and radial flow are two key probes of the expansion dynamics and properties of the quark-gluon plasma (QGP). While anisotropic flow has been extensively studied, radial flow, which governs the system’s radial expansion, has received less attention. Notably, direct experimental evidence for the global and collective nature of radial flow fluctuations has been lacking. This Letter presents the first measurement of transverse momentum ((Formula presented)) dependence of radial flow fluctuations ((Formula presented)) over (Formula presented) and demonstrates its collective nature using a two-particle correlation method in (Formula presented) collisions at (Formula presented). The data reveal three key features supporting the collective nature of radial flow: long-range correlation in pseudorapidity, factorization in (Formula presented), and centrality-independent shape in (Formula presented). The comparison with a hydrodynamic model demonstrates the sensitivity of (Formula presented) to bulk viscosity, a crucial transport property of the QGP. These findings establish a new, powerful tool for probing collective dynamics and properties of the QGP.

Item Type: Article
Uncontrolled Keywords: ATLAS Collaboration
Divisions: Faculty of Science & Engineering
Faculty of Science & Engineering > School of Physical Sciences
Faculty of Science & Engineering > School of Physical Sciences > Physics
Depositing User: Symplectic Admin
Date Deposited: 03 Mar 2026 08:59
Last Modified: 16 Jun 2026 16:49
DOI: 10.1103/ldcn-r2lq
Open Access URL: https://journals.aps.org/prl/abstract/10.1103/ldcn...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3197306
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