Precision Dijet Acoplanarity Tomography of the Chromo Structure of Perfect QCD Fluids

Dijet acoplanarity is dominated by vacuum (Sudakov) pQCD radiation even in Pb+Pb collisions, but future higher precision measurements of the tails of the acoplanarity distributions can help to resolve separately the medium opacity, $\chi =L/\lambda$, and the color screening scale ${\mu }^2$ from the path averaged BDMS saturation scale $Q_s^2[\chi ,\mu ]=\int dL\hat{q}(E,T(L\left)\right)\propto {\mu }^{2}L/\lambda$, that is already well constrained by nuclear modification factor data on $R_{AA}\left(p_T\right)$. We compare Gaussian (BDMS) and non-Gaussian (GLV) models of medium broadening of vacuum (Sudakov) induced acoplanarity distributions in A+A. With few percent accuracy on the ratio of A+A to p+p distributions, experiments can easily identify non-Gaussian Landau and Rutherford tails due to multiple collisions. However, we find that sub-percent precision will be required to constrain χ and μ separately from $Q_s$.