Global polarization of Λ Λ hyperons in Pb-Pb collisions at sNN = 2.76 and 5.02 TeV
(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
- author collaboration
- organization
- publishing date
- 2020-04-20
- 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<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%.}}, 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}}, }