Global polarization of Lambda and (Lambda) over bar hyperons in Pb-Pb collisions at √sNN = 2.76 and 5.02 TeV (CROSBI ID 278637)
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Podaci o odgovornosti
Acharya, S. ; ... ; Antičić, Tome ; ... ; Erhardt, Filip ; ... ; Gotovac, Sven ; ... ; Jerčić, Marko ; ... ; Lončar, Petra ; ... ; Mudnić, Eugen ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ... ; Simatović, Goran ; ... ; Utrobičić, Antonija ; ... ; Vicković, Linda ; ... ; Zurlo, N.
ALICE Collaboration
engleski
Global polarization of Lambda and (Lambda) over bar hyperons in Pb-Pb collisions at √sNN = 2.76 and 5.02 TeV
The global polarization of the Lambda and (Lambda) over bar 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%.
global polarization ; Pb-Pb collisions
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Podaci o izdanju
101 (4)
2020.
044611
14
objavljeno
2469-9985
2469-9993
10.1103/PhysRevC.101.044611