Jet substructure in heavy-ion collisions

Heavy-ion collisions at the LHC and RHIC create a large enough energy density to form a deconfined medium of strongly-interacting quarks and gluons called quark-gluon plasma (QGP). The properties of the QGP including its near-perfect hydrodynamic behavior arising from the interactions between elementary quarks and gluons are not very well understood. Jets have proven to be crucial probes of the QGP as they originate from partons that are produced in initial hard-scatterings in heavy ion collisions, and subsequently pass through and interact with the medium. A rich repository of jet measurements in heavy-ion collisions from LHC and RHIC experiments over the past decade have played an important role in characterizing the Quark-Gluon Plasma. Recent developments in jet constituent reconstruction and grooming techniques have enabled the measurement of jet substructure observables in heavy-ion collisions and compare them to baseline pp results. In this talk, I will present an overview of jet substructure measurements in heavy-ion collisions and their impact on furthering our understanding of the jet-QGP medium interaction mechanisms including the opportunities and challenges that lay ahead.