Isobaric ${}_{44}^{96}$Ru+${}_{44}^{96}$Ru and ${}_{40}^{96}$Zr+${}_{40}^{96}$Zr collisions at

GeV have been conducted at the Relativistic Heavy Ion Collider to circumvent the large flow-induced background in searching for the chiral magnetic effect (cme), predicted by the topological feature of quantum chromodynamics (QCD). Considering that the background in isobar collisions is approximately twice that in Au+Au collisions (due to the smaller multiplicity) and the cme signal is approximately half (due to the weaker magnetic field), we caution that the cme may not be detectable with the collected isobar data statistics, within ∼2σ significance, if the axial charge per entropy density ($n_5/s$) and the QCD vacuum transition probability are system independent. This expectation is generally verified by the Anomalous-Viscous Fluid Dynamics (avfd) model. While our estimate provides an approximate “experimental” baseline, theoretical uncertainties on the cme remain large.

中文翻译：

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重新审视相对论重离子对撞机等压碰撞中手征磁效应的预期

等压 ${}_{44}^{96}$钌+${}_{44}^{96}$汝和 ${}_{40}^{96}$锆+${}_{40}^{96}$Zr 碰撞在

GeV 已经在相对论重离子对撞机上进行，以规避大流动诱导的背景，以寻找由量子色动力学 (QCD) 的拓扑特征预测的手性磁效应 ( cme )。考虑到等压线碰撞的背景大约是 Au+Au 碰撞的两倍（由于较小的多重性）并且cme信号大约是一半（由于较弱的磁场），我们警告说，cme可能无法用收集的等压线数据统计，在 ∼2 σ显着性内，如果每个熵密度的轴向电荷（$n_5/秒$) 和 QCD 真空跃迁概率是系统无关的。这种预期通常由异常粘性流体动力学 ( avfd ) 模型验证。虽然我们的估计提供了一个近似的“实验”基线，但cme 的理论不确定性仍然很大。