Title: Jet v2 vs  Dijet Acoplanarity Tomography Probes of the Chromo Structure of Perfect QCD Fluids

Abstract: 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 distributionscan help to resolve {\em separately} the medium opacity, and the color screening scale μ2 from the path averaged BDMS saturation scale that is already well constrained by the measured nuclear modification factor data on RAA(pT). We estimate the precision needed to discriminate between competing models of the chromo-electric and chromo-magnetic structure of prefect QCD fluids produced in A+A collisions. With few percent accuracy, experiments can easily identify non-gaussian Landau tail of multiple collisions. However, we find that sub-percent precision will be required to constrain χ and μ separately within a factor of 2.

the color screening scale μ2 from the path averaged BDMS saturation scale Q2s[χ,μ]=∫dLq̂ (E,T)∝μ2L/λ that is already well constrained by the measured nuclear modification factor data on RAA(pT). We estimate the precision needed to discriminate between competing models of the chromo-electric and chromo-magnetic structure of prefect QCD fluids produced in A+A collisions. With few percent accuracy, experiments can easily identify non-gaussian Landau tail of multiple collisions. However, we find that sub-percent precision will be required to constrain χ and μ separately within a factor of 2.  
Ref. arXiv:1808.03238 [hep-ph]