Where is the jet quenching in Pb+Pb collisions at 158 AGeV?
Abstract
Because of the rapidly falling particle spectrum at large pT from jet fragmentation at the CERN SPS energy, the high-pT hadron distribution should be highly sensitive to parton energy loss inside a dense medium as predicted by recent perturbative QCD (pQCD) studies. A careful analysis of recent data from CERN SPS experiments via pQCD calculation shows little evidence of energy loss. This implies that either the life-time of the dense partonic matter is very short or one has to re-think about the problem of parton energy loss in dense matter. The hadronic matter does not seem to cause jet quenching in Pb+Pb collisions at the CERN SPS. High-pT two particle correlation in the azimuthal angle is proposed to further clarify this issue.
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