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A highly asymmetric collision event, with one jet with E_T > 100 GeV and no evident recoiling jet, and with high energy calorimeter cell deposits distributed over a wide azimuthal region. Only tracks with p_T > 2.6 GeV are shown, and only calorimeter energy deposits with cell energy E_T > 700 MeV in the electromagnetic calorimeter, and E > 1 GeV in the hadronic calorimeter. The two "lego" plots (on the right) show the detector unrolled with "towers" showing energies. From Observation of a centrality-dependent dijet asymmetry in lead-lead collisions at sqrt(sNN) = 2.76 TeV with the ATLAS detector at the LHC.