We are studying the quark gluon plasma (QGP) produced in the collisions of large nuclei using the modification of jets from their vacuum fragmentation configurations as the propagate through the QGP. These measurements provide unique information about the short range interactions between quarks and gluons from which the low viscosity liquid behavior of the QGP must arise. The high collision energies at the LHC provide access to the largest kinematic range and highest rates of jets produced in heavy ion collisions. We are also interested in measurements of proton-nucleus and proton-proton collisions both as reference systems for nucleus-nucleus collisions and as a place to look for the color glass condensate.
We have leading roles in the calibration of jets in heavy ion collisions as well as the trigger in heavy ion collisions.