Quenching and tomography from the RHIC to the LHC

Abstract. We compare fully perturbative and fully nonperturbative pictures of high-pT energy loss calculations to the first results from 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 will qualitatively distinguish between these two energy loss pictures. Introduction The current and future challenge to theoretical calculations will be to simultaneously describe the multiple high-pT observables measured at RHIC and LHC [1, 2, 3, 4, 5]. This will prove to be a daunting task as a simultaneous description of multiple observables at RHIC is not even at hand [6]. Furthermore, generic argument