Abstract
We discuss mechanisms that change the hadron chemistry for high momentum particles emitted in high energy nuclear collisions. We argue that particle ratios naturally tend to be different from jets in the vacuum. We show results of computations in a model that propagates leading particles through a quark gluon plasma and permits elastic flavor changing processes. We predict less suppression for kaons compared to pions in central collision. We also discuss elliptic flow resulting from flavor changing processes.
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