Non-linear flow modes of identified particles in Pb-Pb collisions at √SNN=5.02 TeV



Acharya, S, Acosta, FT, Adam, J, Adamova, D, Adler, A, Adolfsson, J, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N
et al (show 1016 more authors) (2020) Non-linear flow modes of identified particles in Pb-Pb collisions at √SNN=5.02 TeV JOURNAL OF HIGH ENERGY PHYSICS, 2020 (6). 147-. ISSN 1126-6708, 1029-8479

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Abstract

The p<inf>T</inf>-differential non-linear flow modes, v<inf>4,22</inf>, v<inf>5,32</inf>, v<inf>6,33</inf> and v<inf>6,222</inf> for π±, K±, KS0 , p + p ¯ , Λ + Λ ¯ and ϕ-meson have been measured for the first time at sNN = 5.02 TeV in Pb-Pb collisions with the ALICE detector at the Large Hadron Collider. The results were obtained with a multi-particle technique, correlating the identified hadrons with reference charged particles from a different pseudorapidity region. These non-linear observables probe the contribution from the second and third order initial spatial anisotropy coefficients to higher flow harmonics. All the characteristic features observed in previous p<inf>T</inf>-differential anisotropic flow measurements for various particle species are also present in the non-linear flow modes, i.e. increase of magnitude with increasing centrality percentile, mass ordering at low p<inf>T</inf> and particle type grouping in the intermediate p<inf>T</inf> range. Hydrodynamical calculations (iEBE-VISHNU) that use different initial conditions and values of shear and bulk viscosity to entropy density ratios are confronted with the data at low transverse momenta. These calculations exhibit a better agreement with the anisotropic flow coefficients than the non-linear flow modes. These observations indicate that non-linear flow modes can provide additional discriminatory power in the study of initial conditions as well as new stringent constraints to hydrodynamical calculations. [Figure not available: see fulltext.].

Item Type: Article
Additional Information: 45 pages, 25 captioned figures, 4 tables, authors from page 37, published version, figures at http://alice-publications.web.cern.ch/node/6001
Uncontrolled Keywords: Heavy Ion Experiments
Divisions: Faculty of Science & Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 10 Sep 2021 14:49
Last Modified: 16 Jun 2026 14:07
DOI: 10.1007/JHEP06(2020)147
Open Access URL: https://doi.org/10.1007/JHEP06(2020)147
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3136654
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