Anisotropic flow and flow fluctuations of identified hadrons in Pb-Pb collisions at √<SUP>s</SUP>NN=5<i>.</i>02 TeV



Acharya, S, Adamova, D, Adler, A, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I
et al (show 1022 more authors) (2023) Anisotropic flow and flow fluctuations of identified hadrons in Pb-Pb collisions at √<SUP>s</SUP>NN=5<i>.</i>02 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2023 (5).

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>The first measurements of elliptic flow of <jats:italic>π</jats:italic><jats:sup><jats:italic>±</jats:italic></jats:sup>, K<jats:sup><jats:italic>±</jats:italic></jats:sup>, <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \textrm{p}+\overline{\textrm{p}} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>p</mml:mi> <mml:mo>+</mml:mo> <mml:mover> <mml:mi>p</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math></jats:alternatives></jats:inline-formula>, <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\textrm{K}}_{\textrm{S}}^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula>, <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \Lambda +\overline{\Lambda} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>Λ</mml:mi> <mml:mo>+</mml:mo> <mml:mover> <mml:mi>Λ</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math></jats:alternatives></jats:inline-formula>, <jats:italic>ϕ</jats:italic>, <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\Xi}^{-}+{\overline{\Xi}}^{+} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>Ξ</mml:mi> <mml:mo>−</mml:mo> </mml:msup> <mml:mo>+</mml:mo> <mml:msup> <mml:mover> <mml:mi>Ξ</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mo>+</mml:mo> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>, and <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\varOmega}^{-}+{\overline{\varOmega}}^{+} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>Ω</mml:mi> <mml:mo>−</mml:mo> </mml:msup> <mml:mo>+</mml:mo> <mml:msup> <mml:mover> <mml:mi>Ω</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mo>+</mml:mo> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula> using multiparticle cumulants in Pb–Pb collisions at <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \sqrt{s_{\textrm{NN}}} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mi>NN</mml:mi> </mml:msub> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 5<jats:italic>.</jats:italic>02 TeV are resented. Results obtained with two- (<jats:italic>v</jats:italic><jats:sub>2</jats:sub>{2}) and four-particle cumulants (<jats:italic>v</jats:italic><jats:sub>2</jats:sub>{4}) are shown as a function of transverse momentum, <jats:italic>p</jats:italic><jats:sub>T</jats:sub>, for various collision centrality intervals. Combining the data for both <jats:italic>v</jats:italic><jats:sub>2</jats:sub>{2} and <jats:italic>v</jats:italic><jats:sub>2</jats:sub>{4} also allows us to report the first measurements of the mean elliptic flow, elliptic flow fluctuations, and relative elliptic flow fluctuations for various hadron species. These observables probe the event-by-event eccentricity fluctuations in the initial state and the contributions from the dynamic evolution of the expanding quark–gluon plasma. The characteristic features observed in previous <jats:italic>p</jats:italic><jats:sub>T</jats:sub>-differential anisotropic flow measurements for identified hadrons with two-particle correlations, namely the mass ordering at low <jats:italic>p</jats:italic><jats:sub>T</jats:sub> and the approximate scaling with the number of constituent quarks at intermediate <jats:italic>p</jats:italic><jats:sub>T</jats:sub>, are similarly present in the four-particle correlations and the combinations of <jats:italic>v</jats:italic><jats:sub>2</jats:sub>{2} and <jats:italic>v</jats:italic><jats:sub>2</jats:sub>{4}. In addition, a particle species dependence of flow fluctuations is observed that could indicate a significant contribution from final state hadronic interactions. The comparison between experimental measurements and CoLBT model calculations, which combine the various physics processes of hydrodynamics, quark coalescence, and jet fragmentation, illustrates their importance over a wide <jats:italic>p</jats:italic><jats:sub>T</jats:sub> range.</jats:p>

Item Type: Article
Uncontrolled Keywords: Collective Flow, Heavy Ion Experiments, Particle Correlations and Fluctuations
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 02 Oct 2023 15:33
Last Modified: 19 Oct 2023 09:47
DOI: 10.1007/JHEP05(2023)243
Open Access URL: https://doi.org/10.1007/JHEP05(2023)243
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3173323