ATLAS Measurements of Jets in Heavy-Ion Collisions

A broad program of measurements using heavy ion collisions is underway in ATLAS, with the aim of studying the properties of QCD matter at high temperatures and densities. With the factor of 14 increase in collision energy compared to RHIC data, significant insights have already been achieved. These include the observation of a centrality-dependent dijet asymmetry, which is strongly suggestive of "jet quenching” - strong energy loss of energetic jets in a hot, dense medium. Further results on jet modifications in heavy ion collisions will also be shown, both at the jet and fragmentation function levels. This talk describes measurements performed using up to 9 pb-1 of lead-lead collision data provided at a nucleon center-of-mass energy of 2.76 GeV by the Large Hadron Collider and collected by the ATLAS Detector during November and December 2010.