Measurement of jet properties and their modification
in heavy-ion collisions at RHIC

With the beginning of RHIC running heavy ion physics finally entered a
regime where pQCD phenomena can be fully explored. The anomalous
suppression of high-$p_\perp$ hadrons, now observed by all RHIC
experiments, indicates that a substantial modification of jet properties
is induced by the nuclear medium.  Analysis of the two high-$p_\perp$
particle correlation function allows the statistical disentanglement of
jet fragment pairs apart from other sources of correlation, which let us
then examine the jet fragmentation process directly in heavy-ion
collisions. The jet production in pp, pAu and AuAu collisions at
sqrt{s_NN}=200 GeV will be discussed.