Probing the chiral magnetic wave with charge-dependent flow measurements in Pb-Pb collisions at the LHC
Probing the chiral magnetic wave with charge-dependent flow measurements in Pb-Pb collisions at the LHC
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DOI：
10.1007/jhep12(2023)067
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发表时间：
2023-08
影响因子：
5.4
通讯作者：
Alice Collaboration
中科院分区：
文献类型：
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作者：
Alice Collaboration
手征磁波现象对于深入了解QCD中的强相互作用、夸克-胶子等离子体的性质以及早期宇宙的拓扑特征，提供了对高能碰撞基本物理的更深层次的理解，是至关重要的。为了探测CMW，在每核子-核子碰撞质心能量=5.02TeV的铅-铅碰撞中测量了与电荷有关的各向异性流动系数。特别地，报道了正负电荷粒子的椭圆(V2)和三角形(V3)流量系数的归一化差随其事件归一化数差的斜率。该斜率被发现大于零，并具有类似于的震级，因此表明这些测量的背景贡献很大。此外，可以用包含局部电荷守恒的爆炸波模型计算来描述。此外，使用事件形状工程技术产生与零兼容的CMW(F CMW)对该测量的贡献的一小部分。这一测量提供了f CMW的第一个上限，在10%-60%的中心度区间中，在95%(99.7%)的置信度水平下，它被发现是26%(38%)。
The Chiral Magnetic Wave (CMW) phenomenon is essential to provide insights into the strong interaction in QCD, the properties of the quark-gluon plasma, and the topological characteristics of the early universe, offering a deeper understanding of fundamental physics in high-energy collisions. Measurements of the charge-dependent anisotropic flow coefficients are studied in Pb-Pb collisions at center-of-mass energy per nucleon-nucleon collision= 5. 02 TeV to probe the CMW. In particular, the slope of the normalized difference in elliptic (v 2) and triangular (v 3) flow coefficients of positively and negatively charged particles as a function of their event-wise normalized number difference, is reported for inclusive and identified particles. The slopeis found to be larger than zero and to have a magnitude similar to, thus pointing to a large background contribution for these measurements. Furthermore,can be described by a blast wave model calculation that incorporates local charge conservation. In addition, using the event shape engineering technique yields a fraction of CMW (f CMW) contribution to this measurement which is compatible with zero. This measurement provides the very first upper limit for f CMW, and in the 10–60% centrality interval it is found to be 26%(38%) at 95%(99.7%) confidence level.