Non-linear flow modes of identified particles in Pb-Pb collisions at √sNN = 5.02 TeV
S. Acharya , Daniel Dąbrowski , Kamil Deja , Łukasz Graczykowski , Monika Jakubowska , Małgorzata Janik , Adam Kisiel , Julian Myrcha , Łukasz Neumann , Piotr Nowakowski , Janusz Oleniacz , Jan Pluta , Przemysław Rokita , Krystian Rosłon , Tomasz Trzciński , Barbara Trzeciak , Hanna Zbroszczyk
AbstractThe pT-differential non-linear flow modes, v4,22, v5,32, v6,33 and v6,222 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 pT-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 pT and particle type grouping in the intermediate pT 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.].
|Collective author||ALICE Collaboration|
|Total number of authors||1066|
|Journal series||Journal of High Energy Physics, ISSN 1029-8479, [1126-6708]|
|Publication size in sheets||2.35|
|Keywords in English||Heavy Ion Experiments|
|License||Journal (articles only); author's original; ; after publication|
|Score||= 140.0, 24-09-2020, ArticleFromJournal|
|Publication indicators||= 0; = 0; : 2018 = 1.132; : 2018 = 5.833 (2) - 2018=4.911 (5)|
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