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arXiv 1704.02142nucl-thhep-phnucl-ex
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在RHIC束能量扫描下QGP液体中的涡旋和$Λ$极化

Vorticity in the QGP liquid and $Λ$ polarization at the RHIC Beam Energy Scan

Iu. Karpenko, F. Becattini

摘要:

在3+1维粘性流体动力学模型中,从UrQMD强子/弦级联出发,计算了$Λ$超子及其反粒子的极化.我们发现,随着最近的结果从STAR,在固定的中心的平均极化作为碰撞能量的函数从1.5%,在$\sqrt{s_{\rm NN}}=7.7$ GeV的0.2%,在$\sqrt{s_{\rm NN}}=200$ GeV的减少。我们探讨的影响,导致这种碰撞能量的依赖性,反馈校正和$Λ$和$\barΛ$之间的差异。

英文摘要:

Polarization of $Λ$ hyperons and their antiparticles is calculated in a 3+1 dimensional viscous hydrodynamic model with initial state from UrQMD hadron/string cascade. We find that, along with recent results from STAR, the mean polarization at fixed centrality decreases as a function of collision energy from 1.5% at $\sqrt{s_{\rm NN}}=7.7$ GeV to 0.2% at $\sqrt{s_{\rm NN}}=200$ GeV. We explore the effects which lead to such collision energy dependence, feed-down corrections and a difference between $Λ$ and $\barΛ$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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