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首页> 外文期刊>Physical review, C >Global polarization of Lambda and (Lambda)over-bar hyperons in Pb-Pb collisions at root s(NN)=2.76 and 5.02 TeV
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Global polarization of Lambda and (Lambda)over-bar hyperons in Pb-Pb collisions at root s(NN)=2.76 and 5.02 TeV

机译：Lambda和（Lambda）的全局极化在根S（NN）= 2.76和5.02 Tev处的PB-PB碰撞中的过度条带

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摘要

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%.
机译：在Root S（NN）= 2.76和5.02 TEV的PB-PB碰撞中测量λ和（λ）的全局极化测量用大的HADRON撞机（LHC）记录的PB-PB = 2.76和5.02 TEV。结果以碰撞中心和超谐振横向动量（PT）差异的函数差异为5-50％，0.5 （％）近似为0.01 +/- 0.06（stat。）+/- 0.03 （SYST。）在碰撞中心范围内15-50％，预期最大信号。结果与基于在相对论的重离子碰撞器，流体动脉模型计算的较低碰撞能量下的测量结果的外推，以及基于指向流的碰撞能量依赖性的实证估计的预期兼容，所有这些都预测了LHC能量的全局极化值订单为0.01％。

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