论文标题
对重离子碰撞中K*旋转对齐的撤销效果
Rescattering effect on the measurement of K* spin alignment in heavy-ion collisions
论文作者
论文摘要
非中性相对论重离子碰撞中载体介子的自旋比对提供了对全球夸克极化和强调机制的新颖探测。在本文中，我们讨论了使用URQMD模型的HADRONIC RECTERTING PROCESS引起的短寿命媒介中的旋转对齐，即K*。这种自旋比对与全局夸克极化无关，但不能与实验中全球夸克极化产生的旋转分配有关。相对于反应（生产）平面，发现自旋对齐参数$ρ_{00} $从1/3偏离-0.008（0.03）。这些偏差远大于实现常规全局夸克极化机制以及当前实验精度的所有理论模型的预期信号要大得多，在将测量结果与理论计算进行比较时，应认真考虑。
Spin alignment of vector mesons in noncentral relativistic heavy ion collisions provides a novel probe of the global quark polarization and hadronization mechanism. In this paper, we discuss the spin alignment of a short-lived vector meson, namely K*, arising from the hadronic rescattering process using the UrQMD model. This spin alignment is not related to global quark polarization but cannot be distinguished from those arising from global quark polarization in experiments. The spin alignment parameter $ρ_{00}$ is found to deviate from 1/3 by up to -0.008 (0.03) with respect to the reaction (production) plane. These deviations are much larger than the expected signal from all the theoretical models implementing the conventional global quark polarization mechanism as well as the current experimental precision, and should be considered seriously when comparing measurements with theoretical calculations.
