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Systematic study of flow vector fluctuations in √sNN=5.02 TeV Pb-Pb collisions

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Measurements of the 𝑝T-dependent flow vector fluctuations in Pb-Pb collisions at √𝑠NN=5.02TeV using azimuthal correlations with the ALICE experiment at the Large Hadron Collider are presented. A four-particle correlation approach [ALICE Collaboration, Phys. Rev. C 107, L051901 (2023)] is used to qua...

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Main Authors: Acharya, Shreyasi (Author) , Angelov, Venelin (Author) , Berdnikova, Anastasia (Author) , Bergmann, Luisa (Author) , Crkovská, Jana (Author) , Danisch, Meike (Author) , Feuillard, Victor (Author) , Fokin, Ilya D. (Author) , Glässel, Peter (Author) , Grünwald, Nadine (Author) , Nath, Abhishek (Author) , Pachmayer, Yvonne C. (Author) , Reygers, Klaus (Author) , Schicker, Rainer (Author) , Schlepper, Felix (Author) , Seo, Jinjoo (Author) , Skorodumovs, Georgijs (Author) , Stachel, Johanna (Author) , Stiefelmaier, Stephan (Author) , Veen, Casper Arie van (Author) , Völkl, Martin (Author) , Windelband, Bernd (Author) , Yüncü, Alperen (Author) , Zanone, Federica (Author)
Corporate Author: ALICE (Author)
Format: Article (Journal)
Language:English
Published: June 2024
In: Physical review
Year: 2024, Volume: 109, Issue: 6, Pages: 1-19
ISSN:2469-9993
DOI:10.1103/PhysRevC.109.065202
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevC.109.065202
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevC.109.065202
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Author Notes:S. Acharya et al. (ALICE Collaboration*)
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Summary:Measurements of the 𝑝T-dependent flow vector fluctuations in Pb-Pb collisions at √𝑠NN=5.02TeV using azimuthal correlations with the ALICE experiment at the Large Hadron Collider are presented. A four-particle correlation approach [ALICE Collaboration, Phys. Rev. C 107, L051901 (2023)] is used to quantify the effects of flow angle and magnitude fluctuations separately. This paper extends previous studies to additional centrality intervals and provides measurements of the 𝑝T-dependent flow vector fluctuations at √𝑠NN=5.02TeV with two-particle correlations. Significant 𝑝T-dependent fluctuations of the ⃗𝑉2 flow vector in Pb-Pb collisions are found across different centrality ranges, with the largest fluctuations of up to ∼15% being present in the 5% most central collisions. In parallel, no evidence of significant 𝑝T-dependent fluctuations of ⃗𝑉3 or ⃗𝑉4 is found. Additionally, evidence of flow angle and magnitude fluctuations is observed with more than 5⁢𝜎 significance in central collisions. These observations in Pb-Pb collisions indicate where the classical picture of hydrodynamic modeling with a common symmetry plane breaks down. This has implications for hard probes at high 𝑝T, which might be biased by 𝑝T-dependent flow angle fluctuations of at least 23% in central collisions. Given the presented results, existing theoretical models should be reexamined to improve our understanding of initial conditions, quark-gluon plasma properties, and the dynamic evolution of the created system.
Item Description:Veröffentlicht: 13. Juni 2024
Gesehen am 13.11.2024
*ALICE Collaboration: S. Acharya, V. Anguelov, A. Berdnikova, L. Bergmann, J. Crkovská, M.C. Danisch, V.J.G. Feuillard, I. Fokin, P. Glässel, N.A. Grunwald, A. Nath, Y. Pachmayer, K. Reygers, R. Schicker, F. Schlepper, J.J. Seo, G. Skorodumovs, J. Stachel, S.F. Stiefelmaier, C.A. van Veen, M.A. Völkl, B. Windelband, A. Yuncu, I. Zanone [und 1043 weitere Personen]
Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol, NN ist dabei tiefgestellt
Physical Description:Online Resource
ISSN:2469-9993
DOI:10.1103/PhysRevC.109.065202

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