相对论重离子碰撞中不同极化的$Λ$和$\barΛ$研究
Investigating different $Λ$ and $\barΛ$ polarizations in relativistic heavy-ion collisions
摘要：
基于手征动力学运动方程，采用部分子输运方法研究了旁观质子产生的磁场以及夸克-反夸克矢量相互作用对各种夸克自旋极化的影响.虽然与真空中磁场的结果相比，QGP中的磁场增强了部分子自旋极化的分裂，但$s$和$\bar s$夸克的自旋极化对夸克-反夸克矢量相互作用也很敏感，这对不同的$Λ$和$\bar Λ$自旋极化是相对论重离子碰撞中磁场的良好度量提出了挑战。在部分子动力学条件下，在$\sqrt{s_{NN}}=7.7$ GeV的能量下，不可能获得$Λ$和$\bar Λ$之间的自旋极化的大分裂.
英文摘要：
Based on the chiral kinetic equations of motion, spin polarizations of various quarks, due to the magnetic field induced by spectator protons as well as the quark-antiquark vector interaction, are studied within a partonic transport approach. Although the magnetic field in QGP enhances the splitting of the spin polarizations of partons compared to the results under the magnetic field in vacuum, the spin polarizations of $s$ and $\bar s$ quarks are also sensitive to the quark-antiquark vector interaction, challenging that the different $Λ$ and $\bar Λ$ spin polarization is a good measure of the magnetic field in relativistic heavy-ion collisions. It is also found that there is no way to obtain the large splitting of the spin polarization between $Λ$ and $\bar Λ$ at $\sqrt{s_{NN}}=7.7$ GeV with partonic dynamics.
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