Abstract
Nuclear modification factors for pion production in AuAu and CuCu collisions are analyzed at very high transverse momenta. At pT ≳ 10 GeV/c, the RAA(pT) is determined mostly by the initial-state nuclear modifications (e.g. the EMC effect) and the non-Abelian jet energy loss in the final state. At high momenta these effects together are strong enough to suppress RAA(pT) to below 1 at RHIC energies. We display results using HKN shadowing in our pQCD-improved parton model. Result of a similar calculation at LHC energies for PbPb collisions is also displayed. Based on estimates, a larger opacity value, L/λg ≈ 10 ± 2, is used for the produced partonic matter in central collisions at the LHC.
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