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Long-range transverse-momentum correlations and radial flow in Pb-Pb collisions at the LHC

This Letter presents measurements of long-range transverse-momentum correlations using a new observable, 𝑣0⁡(𝑝T), serving as a probe of event-by-event radial-flow fluctuations, the underlying radial expansion, and the medium’s properties in heavy-ion collisions. Results are reported for inclusive ch...

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Main Authors: Acharya, Shreyasi (Author) , Angelov, Venelin (Author) , Berdnikova, Anastasia (Author) , Bergmann, Luisa (Author) , Bórquez Cárcamo, Andrés G. (Author) , Fokin, Ilya D. (Author) , Glässel, Peter (Author) , Grünwald, Nadine (Author) , Menzel, Marius (Author) , Nath, Abhishek (Author) , Reygers, Klaus (Author) , Schicker, Rainer (Author) , Schlepper, Felix (Author) , Seo, Jinjoo (Author) , Stachel, Johanna (Author) , Stiefelmaier, Stephan (Author) , Veen, Casper Arie van (Author) , Windelband, Bernd (Author) , Zanone, Federica (Author) , Zhang, Biao (Author)
Corporate Author: ALICE (Author)
Format: Article (Journal) Editorial
Language:English
Published: 22 January, 2026
In: Physical review letters
Year: 2026, Volume: 136, Issue: 3, Pages: 1-18
ISSN:1079-7114
DOI:10.1103/l36g-6f46
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/l36g-6f46
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/l36g-6f46
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Author Notes:S. Acharya et al. (ALICE Collaboration*)
Description
Summary:This Letter presents measurements of long-range transverse-momentum correlations using a new observable, 𝑣0⁡(𝑝T), serving as a probe of event-by-event radial-flow fluctuations, the underlying radial expansion, and the medium’s properties in heavy-ion collisions. Results are reported for inclusive charged particles, pions, kaons, and protons across various centrality intervals in Pb-Pb collisions at √𝑠NN =5.02 TeV, recorded by the ALICE detector. A pseudorapidity-gap technique, similar to that used in anisotropic-flow studies, is employed to suppress short-range correlations. At low 𝑝T, a characteristic mass ordering consistent with hydrodynamic collective flow is observed. At higher 𝑝T (>3 GeV/𝑐), protons exhibit larger 𝑣0⁡(𝑝T) than pions and kaons, in agreement with expectations from quark-recombination models. Comparisons to viscous hydrodynamic calculations with varying bulk viscosity and equation of state demonstrate the sensitivity of the 𝑣0⁡(𝑝T) observable to these key medium properties. The findings establish 𝑣0⁡(𝑝T) as a valuable addition to the set of observables used in Bayesian analyses for extracting the transport properties and constraining the equation of state of strongly interacting matter, while also helping to systematically explore its sensitivity and impact within such global studies.
Item Description:Veröffentlicht: 22. Januar 2026
*ALICE Collaboration: S. Acharya, V. Anguelov, A. Berdnikova, L. Bergmann, A.G. Borquez Carcamo, I. Fokin, P. Glässel, N.A. Grundwald, M.W. Menzel, A. Nath, K. Reygers, R. Schicker, F. Schlepper, J.J. Seo, J. Stachel, S.F. Stiefelmaier, C.A. van Veen, B. Windelband, F. Zanone, B. Zhang [und 1049 weitere Personen]
Gesehen am 22.04.2026
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/l36g-6f46

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