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arXiv 2205.02420hep-ph
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旋转和磁场诱导的$Λ/{\bar Λ}$极化和分裂

$Λ/{\bar Λ}$ Polarization and Splitting Induced by Rotation and Magnetic Field

Kun Xu, Fan Lin, Anping Huang, Mei Huang

摘要:

在考虑夸克的轴向矢量相互作用和反常磁矩的动力学夸克模型中,研究了$Λ/{\bar Λ}$的整体极化以及旋转和磁场引起的${\bar Λ}-Λ$极化分裂.结果表明,旋转导致夸克和反夸克自旋极化同号,而磁场反号,对应于${\bar Λ}-Λ$极化分裂.这两种效应的结合导致与实验数据完全一致。在量子上,轴矢量自旋极化贡献了30 $\%$的全局极化,夸克反常磁矩贡献了40 $\%$的${\bar Λ}-Λ$极化分裂.然而,在$\sqrt{s_{NN}} \leq 7.7 \text{GeV}$中,在冻结时达到足够大小的磁场仍然是一个挑战。

英文摘要:

The global polarization of $Λ/{\bar Λ}$ and the splitting of ${\bar Λ}-Λ$ polarization induced by rotation and magnetic field has been investigated in a dynamical quark model by taking into account the axial vector interaction and the anomalous magnetic moment of quarks. It is found that the rotation leads to the spin polarization of quarks and anti-quarks with the same sign, while the magnetic field to opposite sign, which corresponds to the ${\bar Λ}-Λ$ polarization splitting. The combination of the two effects leads to perfect agreement with experiment data. Quantitatively, the axial vector spin polarization contributes 30$\%$ of the global polarization and the anomalous magnetic moment of quarks contributes 40$\%$ to the splitting of ${\bar Λ}-Λ$ polarization. However, at $\sqrt{s_{NN}} \leq 7.7 \text{GeV}$, it still remains a challenge to reach enough magnitude of the magnetic field at freeze-out.

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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