Constraining the Chiral Magnetic Effect with charge-dependent azimuthal correlations in Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ = 2.76 and 5.02 TeV
Constraining the Chiral Magnetic Effect with charge-dependent azimuthal correlations in Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ = 2.76 and 5.02 TeV
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在 $$ sqrt{s_{mathrm{NN}}} $$ = 2.76 和 5.02 TeV 的 Pb-Pb 碰撞中用电荷相关方位角相关性约束手性磁效应
DOI：
10.1007/jhep09(2020)160
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发表时间：
2020
影响因子：
5.4
通讯作者：
Ahmad, S.
中科院分区：
文献类型：
--
作者：
Acharya, S.;Adamová, D.;Adler, A.;Adolfsson, J.;Aggarwal, M. M.;Aglieri Rinella, G.;Agnello, M.;Agrawal, N.;Ahammed, Z.;Ahmad, S.
本文系统地研究了用于探测手征磁效应（CME）的能量为2.76和5.02TeV的Pb-Pb碰撞中的两粒子和三粒子电荷相关关联。这些测量是在赝快度（η）和横动量（p T）范围内对带电粒子进行的| η| < 0。八比零。2< p T< 5 GeV/c。对于CME敏感的衰变子γ 1，1=< cos（φ α+ φ β− 2 <$2）>和γ 1，− 3=< cos（φ α− 3φ β+ 2 <$2）>，报告了一个显著的电荷依赖信号，该信号在外围碰撞中变得更加明显。结果被用来估计的贡献，与本地电荷守恒耦合到各向异性流调制的背景效应，测量的日冕物质抛射。结合局部电荷守恒的爆炸波参数化调整再现中心依赖的背景效应是不能够完全描述测量的γ 1，1。最后，对CME信号不敏感的混合谐波三粒子关联的电荷和中心性依赖性（形式为γ 1，2=< cos（φ α+ 2φ β− 3 <$3）>）再次验证了背景贡献主导γ 1，1的测量。
Systematic studies of charge-dependent two-and three-particle correlations in Pb-Pb collisions at= 2.76 and 5.02 TeV used to probe the Chiral Magnetic Effect (CME) are presented. These measurements are performed for charged particles in the pseudorapidity (η) and transverse momentum (p T) ranges| η|< 0. 8 and 0. 2< p T< 5 GeV/c. A significant charge-dependent signal that becomes more pronounced for peripheral collisions is reported for the CME-sensitive correlators γ 1, 1=< cos (φ α+ φ β− 2Ψ 2)> and γ 1,− 3=< cos (φ α− 3φ β+ 2Ψ 2)>. The results are used to estimate the contribution of background effects, associated with local charge conservation coupled to anisotropic flow modulations, to measurements of the CME. A blast-wave parametrisation that incorporates local charge conservation tuned to reproduce the centrality dependent background effects is not able to fully describe the measured γ 1, 1. Finally, the charge and centrality dependence of mixed-harmonics three-particle correlations, of the form γ 1, 2=< cos (φ α+ 2φ β− 3Ψ 3)>, which are insensitive to the CME signal, verify again that background contributions dominate the measurement of γ 1, 1.