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Acoustic scaling of linear and mode-coupled anisotropic flow; implications for precision extraction of the specific shear viscosity

机译:线性和模式耦合各向异性流动的声学缩放; 对精确提取特定剪切粘度的影响

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摘要

The nth-order linear flow coefficients v(n)(L) (n = 2, 3, 4, 5), and the corresponding nonlinear mode-coupled (mc) coefficients v(4,(2,2))(mc), v(5,(2,3))(mc), v(6,(3,3))(mc), and v(6,(2,2,2))(mc), are studied for Pb+ Pb collisions at root s(NN) = 2.76 TeV. Both sets of coefficients indicate a common acoustic scaling pattern of exponential viscous modulation, with a rate proportional to the square of the harmonic numbers and the mean transverse momenta (respectively), and inversely proportional to the cube root of the charged particle multiplicity [(N-ch)(1/3)], which characterizes the dimensionless size of the systems produced in the collisions. These patterns and their associated scaling parameters provide new stringent constraints for eccentricity-independent estimates of the specific shear viscosity. n/s(T) and the viscous correction to the thermal distribution function for the matter produced in the collisions. They also give crucial constraints for extraction of the initial-state eccentricity spectrum.
机译:n阶线性流量系数V(n)(1)(n = 2,3,4,5),以及相应的非线性模式耦合(MC)系数V(4,(2,2))(MC) ,研究了V(5,(2,3))(MC),V(6,(3,3))(MC)和V(6,(2,2,2))(MC),用于PB + root s(nn)= 2.76 tev的pb碰撞。两组系数表示指数粘性调制的常见声学缩放模式,其与谐波数量的平方和平均横向动量(分别)成比例,并且与带电粒子多重的立方根反向成反比[(n -CH)(1/3)],其特征在于碰撞中产生的系统的无量纲尺寸。这些图案及其相关的缩放参数为特定剪切粘度的偏心估计提供了新的严格约束。 n / s(t)和对碰撞中产生的物质的热分配功能的粘性校正。它们还给出了用于提取初始状态偏心谱的关键约束。

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