Quark-gluon plasma (QGP), a unique phase of matter governed by Quantum Chromodynamics (QCD), is believed to have existed shortly (a few microseconds) after the Big Bang. Jets, collimated particle sprays originating from the fragmentation of hard-scattered quarks or gluons, serve as valuable probes for studying QGP produced in relativistic heavy ion collisions. As jets experience modifications due to the surrounding medium, so-called jet quenching, concurrently, jets influence the medium. Investigating the jet modification and medium response sheds light on the mechanisms of QCD interactions and provides access to properties of the QGP.
In this seminar, I will present the recent ATLAS measurements of jet-hadron correlations in photon+jet events and the color-charge dependence of jet energy loss. Relevant results from RHIC and the LHC will be also discussed.