The quark-gluon plasma (QGP) is the state of matter that exists at temperatures and/or densities beyond those at which normal quantum-chromodynamic (QCD) matter composed of protons and neutrons can exist. Producing and studying this matter is the physics goal driving the heavy-ion programs at the Large Hadron Collider (LHC) and the Relativistic Heavy Ion Collider (RHIC). This matter behaves as a nearly ideal fluid. One of the most active areas of investigation in this field is to use jets, the products of hard quark and gluon scattering, to provide a short length scale probe of the interactions inside the QGP. These measurements are difficult due to the large underlying event and have had limited precision due to the small jet cross-section. With recent running at the LHC, however, there are new measurements sensitive to how jet-QGP interactions depend on the QGP geometry, the structure of the parton shower, and the mass and color charge of the parton initiating the jet. Together these measurements provide a qualitatively improved understanding of how jets interact with the QGP and point the way to new measurements at both RHIC and the LHC with future data.
