标题： 剪切流中大质量费米子的自旋极化：$O(\partial)$处的完整结果 显示英文标题

标题： Spin polarization for massive fermion in a shear flow: complete results at $O(\partial)$

摘要： 受剪切诱导极化在理解重离子碰撞中$\Lambda$超子的局部自旋极化谜团中的关键作用的启发，我们对具有剪切流的量子电动力学等离子体中大质量费米子的自旋极化进行了完整的分析。除了自由理论中众所周知的自旋-剪切耦合外，我们还包含了两个更依赖碰撞的贡献：一个是稳态下由偏移的自旋平均分布固定的非动力学贡献；另一个是遵循自旋演化的动力学贡献。尽管存在对碰撞的依赖性，我们发现最终结果中耦合的依赖性消失了。这些贡献可以在有物理意义的参数范围内显著增强自旋-剪切耦合。 显示英文摘要

摘要： Motivated by the key role of shear induced polarization in understanding the local spin polarization puzzle of $\Lambda$ hyperons in heavy ion collisions, we perform a complete analysis of spin polarization of massive fermion in a quantum electrodynamic plasma with shear flow. Apart from the well-known spin-shear coupling in free theory, we include two more collision dependent contributions: one is a non-dynamical contribution fixed by shifted spin-averaged distribution in steady state; the other is a dynamical contribution following from spin evolution. Despite of the dependencies on collision, we find the dependencies on coupling drop out in the final results. These contributions can lead to significant enhancement of the spin-shear coupling in phenomenologically interesting regime.