Extracting qˆ in event-by-event hydrodynamics and the centrality/energy puzzle

In our analysis, we combine event-by-event hydrodynamics, within the EKRT formulation, with jet quenching -ASW Quenching Weights- to obtain high-pT RAA for charged particles at RHIC and LHC energies for different centralities. By defining a K-factor that quantifies the departure of qˆ from an ideal estimate, K=qˆ/(2ϵ3/4), we fit the single-inclusive experimental data for charged particles. This K-factor is larger at RHIC than at the LHC but, surprisingly, it is almost independent of the centrality of the collision.