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For the past ten years $R_{AA}(p_T)$, the nuclear modification factor thatencodes the suppression of high $p_T$ particles due to energy loss within themedium was fairly well described by many theoretical models. However, the samemodels systematically under-predicted the high $p_T$ elliptic flow, $v_2$,which is experimentally measured as the correlation between soft and hardhadrons. All previous calculations neglected the effect of event-by-eventfluctuations of an expanding viscous hydrodynamical background as well as thesoft-hard flow harmonic correlations in the experimentally measured $v_2$. Inthis talk I show how event-by-event viscous hydrodynamics (computed using thev-USPhydro code) coupled to an energy loss model (BBMG) is able tosimultaneously describe soft physics observables as well as the high-$p_T$$R_{AA}$ and $v_2$. Suggestions for future more differential calculations atthe LHC run2 are made to explore soft-hard flow correlations.

Solving the $R_{AA}\otimes v_2$ puzzle