论文标题
使用爱丽丝探测器搜索PB-PB碰撞中的手性磁波
Search for the Chiral Magnetic Wave in Pb--Pb collisions using the ALICE detector
论文作者
论文摘要
手性异常的相互作用和强磁场（$ \ sim $ 10 $^{15} $ t）在重合离子碰撞中产生的可能会引起夸克 - 格鲁恩等离子体的集体激发，称为手感磁波（CMW）。可以通过电荷不对称（$ a _ {\ rm ch} $）椭圆流$ v_ {2} $的依赖性在实验中寻求这种效果。但是，诸如本地电荷保护（LCC）和集体流程等非CMW机制也可能导致$ v_ {2} $在$ a _ {\ rm ch} $上的类似依赖性。三角流（$ v_ {3} $）测量可作为参考，因为预计不会受到CMW的影响。 $ v_ {2} $和$ v_ {3} $的充电Hadrons作为$ a _ {\ rm ch} $的函数，以$ \ sqrt {s _ {\ s_ {\ rm nn}}} $ = 2.76 $ = 2.76和5.02 tev呈现在$ \ sqrt {s _ {s _ {s _ {s _ {s _ {s _ {s _ {s _ {此外，首次采用了事件形状工程技术（ESE）技术，以定量地删除CMW信号和LCC背景。结果表明背景效应主导了CMW测量值。
The interplay of the chiral anomaly and the strong magnetic field ($\sim$ 10$^{15}$ T) created in heavy-ion collisions could give rise to a collective excitation in the quark--gluon plasma called the Chiral Magnetic Wave (CMW). This effect can be experimentally sought by the charge asymmetry ($A_{\rm ch}$) dependence of elliptic flow $v_{2}$. However, non-CMW mechanisms such as local charge conservation (LCC) coupled with collective flow can also lead to a similar dependence of $v_{2}$ on $A_{\rm ch}$. The triangular flow ($v_{3}$) measurement serves as a reference as it is not expected to be affected by the CMW. The $v_{2}$ and $v_{3}$ of charged hadrons as a function of $A_{\rm ch}$ measured in Pb--Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 and 5.02 TeV are presented. In addition, the event-shape engineering (ESE) technique is adopted for the first time to quantitatively disentangle the CMW signal and the LCC background. The results indicate that the background effects dominate the CMW measurements.
