Initial-State Bremsstrahlung versus Final-State Hydrodynamic Sources of Azimuthal Harmonics at RHIC and LHC
ORAL
Abstract
Recent azimuthal correlation data from the Beam Energy Scan (BES) and d+Au runs at RHIC/BNL and, the surprising similarity of multiparticle cummulant azimuthal harmonics in p+Pb and Pb+Pb at LHC have challenged the uniqueness of local equilibrium ``perfect fluid'' interpretations of those data. We report results derived in arXiv:1405.7825 [hep-ph] on azimuthal harmonics arising from initial-state non-abelian ``wave interference'' effects predicted by perturbative QCD sourced by Color Scintillation Arrays (CSA) of color antennas associated with multiple projectile and target soft beam jets. We find a remarkable similarity between azimuthal harmonics sourced by initial state CSA and those predicted with final state perfect fluid models of high energy p+A reactions.
*Supported in part by the US Department of Energy, Office of Science, Office of Nuclear Physics
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