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Article
Report number arXiv:2308.16590 ; CERN-EP-2023-196
Title Measurements of long-range two-particle correlation over a wide pseudorapidity range in pPb collisions at sNN=5.0 TeV Measurements of long-range two-particle correlation over a wide pseudorapidity range in pPb collisions at sNN=5.0 TeV
Author(s) ALICE Collaboration  Show all 1053 authors
Corporate author(s) The ALICE collaboration
Publication 2024-01-31
Imprint 30 Aug 2023
Number of pages 30
Note 27 pages, 11 captioned figures, 2 tables, authors from page 21, published version, figures at http://alice-publications.web.cern.ch/node/9604
Published in: JHEP 2401 (2024) 199
DOI 10.1007/JHEP01(2024)199
Subject category Nuclear Physics - Experiment ; Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ALICE
Keywords relativistic heavy ion physics ; quark gluon plasma ; global features ; particle correlations and fluctuations ; collective flow ; experimental results
Abstract Correlations in azimuthal angle extending over a long range in pseudorapidity between particles, usually called the “ridge” phenomenon, were discovered in heavy-ion collisions, and later found in pp and p–Pb collisions. In large systems, they are thought to arise from the expansion (collective flow) of the produced particles. Extending these measurements over a wider range in pseudorapidity and final-state particle multiplicity is important to understand better the origin of these long-range correlations in small-collision systems. In this Letter, measurements of the long-range correlations in p–Pb collisions at sNN=5.02 TeV are extended to a pseudorapidity gap of Δη8 between particles using the ALICE, forward multiplicity detectors. After suppressing non-flow correlations, e.g., from jet and resonance decays, the ridge structure is observed to persist up to a very large gap of Δη8 for the first time in pPb collisions. This shows that the collective flow-like correlations extend over an extensive pseudorapidity range also in small-collision systems such as p–Pb collisions. The pseudorapidity dependence of the second-order anisotropic flow coefficient, v2(η), is extracted from the long-range correlations. The v2(η) results are presented for a wide pseudorapidity range of 3.1<η<4.8 in various centrality classes in pPb collisions. To gain a comprehensive understanding of the source of anisotropic flow in small-collision systems, the v2(η) measurements are compared to hydrodynamic and transport model calculations. The comparison suggests that the final-state interactions play a dominant role in developing the anisotropic flow in small-collision systems.
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Copyright/License Preprint: © 2023-2024 CERN (License: CC-BY-4.0)
Publication: © 2024 CERN (License: CC BY 4.0), sponsored by SCOAP³
Submitted by javier.castillo.castellanos@cern.ch



 


 Record created 2023-08-30, last modified 2024-11-27


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