论文标题
$λ/{\barλ} $旋转和磁场引起的极化和分裂
$Λ/{\bar Λ}$ Polarization and Splitting Induced by Rotation and Magnetic Field
论文作者
论文摘要
$λ/{\barλ} $的全局极化以及通过旋转和磁场引起的$ {\barλ} - λ$极化的分裂已在动态夸克模型中考虑了轴向矢量的相互作用和夸克的异常磁矩。发现旋转会导致具有相同符号的夸克和反夸克的自旋极化，而磁场到相对的磁场对应于$ {\barλ}-λ$偏振分裂。两种效果的结合导致与实验数据完全一致。量词上，轴向矢量自旋极化贡献了30 $ \％的全局极化，而夸克的异常磁矩为$ {\barλ}-λ$极化的分裂贡献了40 $ \％$。但是，在$ \ sqrt {s_ {nn}} \ leq 7.7 \ text {gev} $上，在冻结时达到足够的磁场幅度仍然是一个挑战。
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.
