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Jet production in relativistic heavy ion collisions is studied using Pb+Pbcollisions at a center of mass energy of 2.76 TeV per nucleon. The measurementsreported here utilize data collected with the ATLAS detector at the LHC fromthe 2010 Pb ion run corresponding to a total integrated luminosity of 7 inversemicrobarns. The results are obtained using fully reconstructed jets using theanti-kt algorithm with a per-event background subtraction procedure. Acentrality-dependent modification of the dijet asymmetry distribution isobserved, which indicates a higher rate of asymmetric dijet pairs in centralcollisions relative to peripheral and pp collisions. Simultaneously the dijetangular correlations show almost no centrality dependence. These resultsprovide the first direct observation of jet quenching. Measurements of thesingle inclusive jet spectrum, measured with jet radius parameters R =0.2,0.3,0.4 and 0.5, are also presented. The spectra are unfolded to correctfor the finite energy resolution introduced by both detector effects andunderlying event fluctuations. Single jet production, through thecentral-to-peripheral ratio RCP, is found to be suppressed in centralcollisions by approximately a factor of two, nearly independent of the jet pT.The RCP is found to have a small but significant increase with increasing R,which may relate directly to aspects of radiative energy loss.

Jet Quenching in Relativistic Heavy Ion Collisions at the LHC