Quenching and Tomography from RHIC to LHC

Understand

We compare fully perturbative and fully nonperturbative pictures of high-pT energy loss calculations to the first results from LHC.

• While over-suppressed 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.