Non-linear flow modes of identified particles in Pb-Pb collisions at root S-NN=5.02 TeV

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The ALICE Collaboration , Acharya , S , Kim , D J , Krizek , F , Orava , R , Parkkila , J E , Rak , J , Rytkönen , H M , Räsänen , S , Saarimäki , O A M , Slupecki , M , Snellman , T W , Trzaska , W H & Zhou , Z 2020 , ' Non-linear flow modes of identified particles in Pb-Pb collisions at root S-NN=5.02 TeV ' , Journal of High Energy Physics , no. 6 , 147 .

Title: Non-linear flow modes of identified particles in Pb-Pb collisions at root S-NN=5.02 TeV
Author: The ALICE collaboration; Acharya, S.; Kim, D. J.; Krizek, F.; Orava, R.; Parkkila, J. E.; Rak, J.; Rytkönen, Heidi Maria; Räsänen, Sami; Saarimäki, Oskari Antti Matti; Slupecki, M.; Snellman, T. W.; Trzaska, W. H.; Zhou, Z.
Contributor organization: Helsinki Institute of Physics
Date: 2020-06-24
Language: eng
Number of pages: 48
Belongs to series: Journal of High Energy Physics
ISSN: 1029-8479
Abstract: The p(T)-differential non-linear flow modes, v(4,22), v(5,32), v(6, 33) and v(6,222) for pi(+/-), K-+/-, K-S(0), p + (p) over bar, Lambda + (Lambda) over bar and phi-meson have been measured for the first time at root 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(T) -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(T )and particle type grouping in the intermediate p(T) 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.
Subject: 114 Physical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

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