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Hard partons propagating through hot and dense matter lose energy, leading tothe observed depletion of hard hadron spectra in nucleus nucleus collision ascompared to scaled proton proton collisions. This lost energy has to beredistributed in the medium due to the conservation of energy, which ismanifest in the p_T dependence of the angular correlation pattern of hadronsassociate with a (semi-) hard trigger. While at low p_T a splitting of a broadpeak is observed, at high p_T the structure shows vacuum width, albeit withreduced yield. This sugests a transfer of energy from hard partons to acollectively recoiling medium. We present a systematic study of these phenomenausing a realistic medium evolution and a Monte-Carlo simulation of theexperimental trigger and show what information about the medium can be derivedfrom multiparticle correlations.Comment: Talk given at the XI International Workshop on Correlation and  Fluctuation in Multiparticle Production, Hangzhou, China, 21-24 Nov. 200

PROSPECTS OF MEDIUM TOMOGRAPHY USING 2-, 3- AND 4-PARTICLE CORRELATIONS FOR A (SEMI)-HARD TRIGGER