Global polarization of Λ and (Λ)over-bar hyperons in Pb-Pb collisions at √sNN=2.76 and 5.02 TeV

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초록

The global polarization of the Lambda and (Lambda) over bar hyperons is measured for Pb-Pb collisions at root s(NN) = 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 vertical bar y vertical bar < 0.5. The hyperon global polarization averaged for Pb-Pb collisions at root s(NN) = 2.76 and 5.02 TeV is found to be consistent with zero, < P-H > (%) approximate to 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%.

키워드

FLOW
제목
Global polarization of Λ and (Λ)over-bar hyperons in Pb-Pb collisions at √sNN=2.76 and 5.02 TeV
저자
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DOI
10.1103/PhysRevC.101.044611
발행일
2020-04-20
유형
Article
저널명
Physical Review c
101
4