Quenching and tomography from the RHIC to the LHC

We compare fully perturbative and fully nonperturbative pictures of high-pT energy loss calculations to the first results from the LHC. While oversuppressed compared to published ALICE data, parameter-free pQCD predictions based on the WHDG energy loss model constrained to RHIC data simultaneously describe well the preliminary CMS hadron suppression, ATLAS charged hadron v2, and ALICE D meson suppression; we also provide for future reference WHDG predictions for B meson RAA. However, energy loss calculations based on AdS/CFT also qualitatively describe well the RHIC pion and non-photonic electron suppression and LHC charged hadron suppression. We propose the double-ratio of charm to bottom quark RAA as a qualitative distinguisher between these two energy loss pictures. © 2011 IOP Publishing Ltd.