Global polarization of Λ and (Λ)over-bar hyperons in Pb-Pb collisions at √<i>s<sub>NN</sub></i>=2.76 and 5.02 TeV



Acharya, S, Adamova, D, Adhya, SP, Adler, A, Adolfsson, J, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z
et al (show 1016 more authors) (2020) Global polarization of Λ and (Λ)over-bar hyperons in Pb-Pb collisions at √<i>s<sub>NN</sub></i>=2.76 and 5.02 TeV. PHYSICAL REVIEW C, 101 (4). 044611-.

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Abstract

The global polarization of the Λ and Λ hyperons is measured for Pb-Pb collisions at sNN=2.76 and 5.02 TeV recorded with the ALICE at the Large Hadron Collider (LHC). The results are reported differentially as a function of collision centrality and hyperon's transverse momentum (pT) for the range of centrality 5-50%, 0.5<pT<5 GeV/c, and rapidity |y|<0.5. The hyperon global polarization averaged for Pb-Pb collisions at sNN=2.76 and 5.02 TeV is found to be consistent with zero, (PH)(%)≈0.01±0.06(stat.)±0.03(syst.) in the collision centrality range 15-50%, where the largest signal is expected. The results are compatible with expectations based on an extrapolation from measurements at lower collision energies at the Relativistic Heavy Ion Collider, hydrodynamical model calculations, and empirical estimates based on collision energy dependence of directed flow, all of which predict the global polarization values at LHC energies of the order of 0.01%.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 09 Sep 2021 10:25
Last Modified: 20 Jun 2024 18:59
DOI: 10.1103/PhysRevC.101.044611
Open Access URL: https://doi.org/10.1103/PhysRevC.101.044611
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3136493