Title: Event-by-event hydrodynamics + jet energy loss: A solution to the RAA x  v2 puzzle

Speaker: Jorge Noronha (Sao Paolo)

Abstract: High pT > 10 GeV elliptic flow, which is experimentally measured via the correlation between soft and hard hadrons, receives competing contributions from event-by-event fluctuations of the low pT elliptic flow and event plane angle fluctuations in the soft sector. A proper account of these event-by-event fluctuations in the soft sector, modeled via viscous hydrodynamics, combined with a jet energy loss model reveal that the positive contribution from low pT elliptic fluctuations overwhelms the negative contributions from event plane fluctuations, which leads to an enhancement of high pT elliptic flow in comparison to previous calculations. This provides a natural solution to the decade long RAA x v2 puzzle in heavy ion collisions. We also present the first theoretical calculation of high pT triangular flow, which is shown to be compatible with current LHC data. Furthermore, we discuss how short wavelength jet-medium physics can be deconvoluted from the physics of soft, bulk event-by-event flow observables using event shape engineering techniques.