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Global polarization of Λ and anti-Λ hyperons in Pb-Pb collisions at √sNN = 2.76 and 5.02 TeV

Acharya S.
•
Adamova D.
•
Adhya S. P.
altro
Zurlo N.
2020
  • journal article

Periodico
PHYSICAL REVIEW C
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<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%.
DOI
10.1103/PhysRevC.101.044611
WOS
WOS:000526791100008
Archivio
http://hdl.handle.net/11368/2968502
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85085059074
https://journals.aps.org/prc/abstract/10.1103/PhysRevC.101.044611
Diritti
open access
FVG url
https://arts.units.it/bitstream/11368/2968502/1/PRC_101(2020)044611_1-14.pdf
Soggetti
  • ALICE

  • hyperons

Web of Science© citazioni
56
Data di acquisizione
Mar 18, 2024
Visualizzazioni
2
Data di acquisizione
Apr 19, 2024
Vedi dettagli
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