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Preprint
Report number arXiv:2411.09323 ; CERN-EP-2024-299
Title Observation of partonic flow in proton–proton and proton–nucleus collisions
Author(s) Acharya, Shreyasi (Clermont-Ferrand U.) ; Agarwal, Apar (Calcutta, VECC) ; Aglieri Rinella, Gianluca (CERN) ; Aglietta, Luca (Turin U. ; INFN, Turin) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Bologna U. ; INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) ; Ahuja, Ishaan (Kosice U.) Show all 1066 authors
Corporate author(s) The ALICE collaboration
Publication 2024
Collaboration ALICE
Imprint 08 Nov 2024
Number of pages 22
Note 22 pages, 4 captioned figures, 2 tables, authors from page 16, figures at http://alice-publications.web.cern.ch/node/11735
Subject category Nuclear Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ALICE
Keywords quark gluon plasma ; collective flow ; experimental results
Abstract Quantum Chromodynamics predicts a phase transition from ordinary hadronic matter to the quark–gluon plasma (QGP) at high temperatures and energy densities, where quarks and gluons (partons) are not confined within hadrons. The QGP is generated in ultrarelativistic heavy-ion collisions. Anisotropic flow coefficients, quantifying the anisotropic azimuthal expansion of the produced matter, provide a unique tool to unravel QGP properties. Flow measurements in high-energy heavy-ion collisions show a distinctive grouping of anisotropic flow for baryons and mesons at intermediate transverse momentum, a feature associated with flow being imparted at the quark level, confirming the existence of the QGP. The observation of QGP–like features in relativistic proton–proton and proton–ion collisions has sparked debate about possible QGP formation in smaller collision systems, which remains unresolved. In this article, we demonstrate for the first time the distinctive grouping of anisotropic flow for baryons and mesons in high-multiplicity proton–lead and proton–proton collisions at the Large Hadron Collider (LHC). These results are described by a model that includes hydrodynamic flow followed by hadron formation via quark coalescence, replicating features observed in heavy-ion collisions. This observation is consistent with the formation of a partonic flowing system in proton–proton and proton–lead collisions at the LHC.
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Copyright/License Preprint: © 2024-2025 CERN (License: CC-BY-4.0)
Submitted by francesco.prino@cern.ch



 


 Record created 2024-11-08, last modified 2025-01-15


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