Abstract We compute the Λ and Λ ‾ global polarization in semi-central heavy-ion collisions modeling the source as consisting of a high-density core and a less dense corona. We show that when more Λs than Λ ‾ s are produced in the corona, and this is combined with a smaller number of Λs coming from the core, as compared to those coming from the corona, an amplification effect for the Λ ‾ with respect to that of Λ polarization can occur. This amplification becomes more important for lower collision energies and quantitatively accounts for the Λ and Λ ‾ polarizations measured by the STAR beam energy scan.

中文翻译：

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核心遇到电晕：解释半中心重离子碰撞中 Λ 和 Λ‾ 全局极化的双分量源

摘要 我们计算了半中心重离子碰撞中的 Λ 和 Λ ‾ 全局极化，将源建模为由高密度核心和密度较低的日冕组成。我们表明，当日冕中产生的 Λs 多于 Λ ‾ s 时，与来自电晕的那些相比，来自核心的 Λs 数量较少，这对 Λ ‾ 的放大效应与可能发生 Λ 极化。这种放大对于较低的碰撞能量变得更加重要，并且定量地解释了由 STAR 束能量扫描测量的 Λ 和 Λ ‾ 极化。