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

Abstract

The 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 authorALICE Collaboration
Author S. Acharya - [Variable Energy Cyclotron Centre India]
S. Acharya,,
-
-
, Daniel Dąbrowski (FP / NPD)
Daniel Dąbrowski,,
- Nuclear Physics Division
, Kamil Deja (FEIT / ICS)
Kamil Deja,,
- The Institute of Computer Science
, Łukasz Graczykowski (FP / NPD)
Łukasz Graczykowski,,
- Nuclear Physics Division
, Monika Jakubowska (FoEE / ICIE)
Monika Jakubowska,,
- The Institute of Control and Industrial Electronics
, Małgorzata Janik (FP / NPD)
Małgorzata Janik,,
- Nuclear Physics Division
, Adam Kisiel (FP / NPD)
Adam Kisiel,,
- Nuclear Physics Division
, Julian Myrcha (FEIT / ICS)
Julian Myrcha,,
- The Institute of Computer Science
, Łukasz Neumann (FEIT / ICS)
Łukasz Neumann,,
- The Institute of Computer Science
, Piotr Nowakowski (FEIT / ICS)
Piotr Nowakowski,,
- The Institute of Computer Science
et al.`
Total number of authors1066
Journal seriesJournal of High Energy Physics, ISSN 1029-8479, [1126-6708]
Issue year2020
Vol2020
No6
Pages1-48
Publication size in sheets2.35
Article number147
Keywords in EnglishHeavy Ion Experiments
ASJC Classification3106 Nuclear and High Energy Physics
DOIDOI:10.1007/JHEP06(2020)147
URL https://link.springer.com/article/10.1007%2FJHEP06%282020%29147
Languageen angielski
LicenseJournal (articles only); author's original; Uznanie Autorstwa (CC-BY); after publication
File
Acharya2020_Article_Non-linearFlowModesOfIdentifie.pdf 1.62 MB
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 24-09-2020, ArticleFromJournal
Publication indicators Scopus Citations = 0; WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.132; WoS Impact Factor: 2018 = 5.833 (2) - 2018=4.911 (5)
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