  The PHENIX collaboration has developed novel methodologies for reliable
extraction of jet functions from two and three particle azimuthal correlation
functions measured at mid-rapidity in Au+Au collisions at $\sqrt s=200$ GeV.
The extracted jet shape and the yield of jet-associated partner hadrons (per
trigger hadron) are found to vary with particle type and collision centrality,
indicating a significant effect of the nuclear collision medium on the (di)jet
fragmentation process.
