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

Acharya, S ; Adolfsson, Jonatan LU ; Christiansen, Peter LU ; Matonoha, Oliver LU ; Nassirpour, Adrian LU orcid ; Oskarsson, Anders LU ; Richert, Tuva LU ; Vazquez Rueda, Omar LU ; Silvermyr, David LU orcid and Stenlund, Evert LU , et al. (2020) In Physical Review C 101(4).
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... (More)
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%. (Less)
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author collaboration
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review C
volume
101
issue
4
article number
044611
publisher
American Physical Society
external identifiers
  • scopus:85085059074
ISSN
2469-9985
DOI
10.1103/PhysRevC.101.044611
language
English
LU publication?
yes
id
2b14b27d-fce9-4fe8-b19d-7cb3151c4e88
date added to LUP
2020-06-24 15:49:19
date last changed
2023-04-10 15:32:10
@article{2b14b27d-fce9-4fe8-b19d-7cb3151c4e88,
  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&lt;pT&lt;5 GeV/c, and rapidity |y|&lt;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%.}},
  author       = {{Acharya, S and Adolfsson, Jonatan and Christiansen, Peter and Matonoha, Oliver and Nassirpour, Adrian and Oskarsson, Anders and Richert, Tuva and Vazquez Rueda, Omar and Silvermyr, David and Stenlund, Evert and Zurlo, N}},
  issn         = {{2469-9985}},
  language     = {{eng}},
  month        = {{04}},
  number       = {{4}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review C}},
  title        = {{Global polarization of Λ Λ hyperons in Pb-Pb collisions at sNN = 2.76 and 5.02 TeV}},
  url          = {{http://dx.doi.org/10.1103/PhysRevC.101.044611}},
  doi          = {{10.1103/PhysRevC.101.044611}},
  volume       = {{101}},
  year         = {{2020}},
}