Abstract
Based on a multiphase transport model, medium modifications of prompt photon-tagged jet fragmentation function are investigated by comparing prompt photon-tagged hadron azimuthal correlation in $\text{Au}+\text{Au}$ collisions (0%--40%) with that in $p+p$ collisions at $\sqrt{{s}_{{}_{\mathrm{NN}}}}=200$ GeV. The measured modification factor ${I}_{AA}$ increases with the increasing integration range of the away side, which reveals a medium-modified jet shape in which the medium enhancement of soft particles is preferentially located far away from the jet axis. ${I}_{AA}$ largely results from strong interactions between jets and partonic matter. However, both hadronization of coalescence and hadronic rescatterings play certain roles to modify the ${I}_{AA}$. These behaviors reflect a dynamical evolution of modifications of the prompt photon-tagged jet fragmentation function in high-energy heavy-ion collisions.
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