Title: Looking Inside Jets to Explore QCD and the Quark-Gluon Plasma

Abstract: Jets, collimated sprays of particles produced by high-momentum quarks and gluons, are powerful probes of QCD. Jet substructure observables exploit patterns inside jets to map QCD dynamics across many scales. They have become precision tools for testing perturbative QCD and for measurements ranging from Higgs boson studies and BSM searches to probing the quark-gluon plasma (QGP). Under extreme conditions of high temperature and energy density, quarks and gluons become deconfined and form the QGP, a state of matter that filled the early universe and is recreated in relativistic heavy-ion collisions. As jets traverse the medium, they lose energy and undergo modifications to their internal structure, a phenomenon known as jet quenching. While jet quenching is well established, the microscopic properties of the QGP and the mechanisms driving energy loss remain elusive. In this talk, I will present recent measurements of jet substructure in heavy-ion collisions and discuss how increasingly differential observables, including energy correlators, are helping to disentangle the mechanisms of jet quenching and probe both fundamental QCD dynamics and the properties of the QGP.