Measurements of long-range two-particle correlation over a wide pseudorapidity range in p-Pb collisions at √s.sub.NN./sub.=5.02 TeV

0585195 - ÚJF 2025 RIV US eng J - Článek v odborném periodiku
Acharya, S. - Adamová, Dagmar - Aglieri Rinella, G. - Agnello, M. - Bielčík, J. - Bielčíková, Jana - Broz, M. - Contreras, J. G. - Filová, V. - Grecká, Ekaterina - Grund, D. - Haidlová, S. - Herman, T. - Isakov, Artem - Khuntia, A. - Kotliarov, Artem - Krupová, D. M. - Křížek, Filip - Kushpil, Svetlana - Šafařík, K. - Torres, S. R. - Závada, Petr … celkem 1054 autorů
Measurements of long-range two-particle correlation over a wide pseudorapidity range in p-Pb collisions at √s_NN=5.02 TeV.
Journal of High Energy Physics. Roč. 2024, č. 1 (2024), č. článku 199. ISSN 1029-8479. E-ISSN 1029-8479
Výzkumná infrastruktura: CERN-CZ III - 90240
Institucionální podpora: RVO:68378271 ; RVO:61389005
Klíčová slova: ALICE collaboration * collective flow * heavy ion experiments
Obor OECD: Nuclear physics; Particles and field physics (FZU-D)
Impakt faktor: 5.4, rok: 2022
Způsob publikování: Open access
https://doi.org/10.1007/JHEP01(2024)199

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 root s(NN) = 5.02 TeV are extended to a pseudorapidity gap of Delta eta similar to 8 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 Delta eta similar to 8 for the first time in p-Pb 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, v(2)(eta), is extracted from the long-range correlations. The v(2)(eta) results are presented for a wide pseudorapidity range of -3.1 < eta < 4.8 in various centrality classes in p-Pb collisions. To gain a comprehensive understanding of the source of anisotropic flow in small collision systems, the v(2)(eta) measurements are compared with 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.
Trvalý link: https://hdl.handle.net/11104/0352938