论文标题
在$ \ sqrt S _ {\ Mathrm {nn}} = 200 $ GEV的重离子冲突中背景和手性磁性驱动的电荷分离的缩放属性 -
Scaling properties of background- and chiral-magnetically-driven charge separation in heavy ion collisions at $\sqrt s_{\mathrm{NN}}=200$ GeV
论文作者
论文摘要
异常的粘性流体动力学模型AVFD与电荷敏感的相关器$ r_ {ψ_2}（δs）$一起使用，以研究背景和手性驱动（CME）电荷分离（$ΔS$）的缩放属性（$ΔS$），其特征是反向变化。 $ r_ {ar_ {r_ {ψ_2}}} $ $ r_ {ψ_{ψ_{2}}（δs）$ distributions在$ \ sqrt s _ {\ sqrt s _ {\ sqrt s _ {\ mathrm {nn} = 200 $ gev中获得的$ r_ {ψ_2}} $的$ \ \ mathrm {σ^{ - 2} _ {r_ {r_ {r_ {r {ψ_2}}} $。 $ \ mathrm {σ^{ - 2} _ {r_ {ψ_2}}}} $值的$值观察到了事件形状独立于事件。但是，它们以相互带电的粒子多重性$（1/\左<n _ {\ rm ch} \ right>）$缩放，这表明对信号的辨别背景和RU+RU+RU和ZR+ZR碰撞中背景之间的差异的差异估计有强大的估计。相比之下，信号 +背景显示特征性$ 1/\ left <n _ {\ rm ch} \ right> $缩放违规行为的$ \ mathrm {σ^{ - 2} _ {r_ {r_ {ar_ {ψ_2}}} $值show特征$ 1/\ left <n _ {\ rm ch} \ right>。对最近的$ {r_ {ψ_2}（δs）} $测量的更正\ cite {star：2021mii}，该{star：2021mii}解释了RU+RU和ZR+ZR碰撞的背景差异，这表明电荷分离差与CME兼容。结果进一步表明，$ \ mathrm {σ^{ - 2} _ {r_ {ψ_2}}} $测量与$ 1/\左<n _ {\ rm ch} \ ch} \ ch} \ right> $ scaleing一起进行外围和中心碰撞的测量，提供了可靠的约束，可量化背景和辅助辅助化的特征。
The Anomalous Viscous Fluid Dynamics model, AVFD, is used in concert with the charge-sensitive correlator $R_{Ψ_2}(ΔS)$ to investigate the scaling properties of background- and chiral-magnetically-driven (CME) charge separation ($ΔS$), characterized by the inverse variance $\mathrm{σ^{-2}_{R_{Ψ_2}}}$ of the $R_{Ψ_{2}}(ΔS)$ distributions obtained in collisions at $\sqrt s_{\mathrm{NN}}=200$ GeV. The $\mathrm{σ^{-2}_{R_{Ψ_2}}}$ values for the background are observed to be event-shape-independent. However, they scale with the reciprocal charged-particle multiplicity $(1/\left< N_{\rm ch} \right>)$, indicating an essential constraint for discerning background from the signal and a robust estimate of the difference between the backgrounds in Ru+Ru and Zr+Zr collisions. By contrast, the $\mathrm{σ^{-2}_{R_{Ψ_2}}}$values for signal + background show characteristic $1/\left< N_{\rm ch} \right>$ scaling violations that characterize the CME-driven contributions. Corrections to recent ${R_{Ψ_2}(ΔS)}$ measurements \cite{STAR:2021mii} that account for the background difference in Ru+Ru and Zr+Zr collisions indicate a charge separation difference compatible with the CME. The results further suggest that $\mathrm{σ^{-2}_{R_{Ψ_2}}}$ measurements for peripheral and central collisions in concert with $1/\left< N_{\rm ch} \right>$ scaling, provides a robust constraint to quantify the background and aid characterization of the CME.
