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Direct photons, being colorless objects, provide an unmodified controlparticle that can be used in conjunction with jets to probe the quark-gluonplasma. To leading order the direct photon momentum balances the momentum ofopposing jets and can therefore provide a clean handle on the jet energy.Therefore, angular correlations with direct photons provide a mechanism tostudy the fragmentation of the opposing jet without performing jetreconstruction. Jet fragmentation modification has been measured previously inPHENIX in central Au+Au collisions. Recent RHIC runs offer the potential tostudy these observables in heavy ion collisions with greater statistics andover different collision systems including asymmetric collision geometries. Inthis talk we present results of isolated direct photon-triggered correlationsin d+Au collisions and discuss the constraints of cold nuclear matter effectson the fragmentation functions. We also present the latest results with higherstatistics on direct photon-triggered correlations in Au+Au collisionsincluding differential measurements of fragmentation function modification.Finally, we present the status of the centrality and collision speciesdependence of these observables, including comparisons to related dihadroncorrelations. Together these results can give a view of jet modification goingfrom small to large system size.

Study of cold and hot nuclear matter effects on jets with direct photon triggered correlations from PHENIX