Asymmetric Jet Broadening and the RAA x v2 Puzzle

For decades, a coupled description of the nuclear modification factor (RAA) and anisotropic flow (vn) of hard particles in relativistic heavy ion collisions that are theorized to generate Quark Gluon Plasma (QGP), especially at the Large Hadron Collider (LHC), has been an enduring challenge in the field. Many attempts have made substantial strides in effectively modeling RAA and the generation of anisotropic flow for very hard particles (pT > 10 GeV), however the anisotropic flow of low-pT (1 GeV < pT < 10 GeV) hard particles has been dramatically underpredicted by all models based on first principles perturbative QCD calculations of jet-medium interactions including energy loss and symmetric momentum broadening. We discuss the phenomenological effect of the emerging class of asymmetric jet-broadening effects coupling to the QGP flow and gradients of flow and temperature on jet anisotropic flow, showing that these effects are integral to a fully coupled description of RAA and vn.