Asymmetry in ATLAS

This event is highly asymmetric: there are two opposite jets visible as bunches of tracks in the event display to the left but only one (at about 10 o'clock) shows high energy. We can see this clearly in the lego plots at center and right: each has only one tall tower to indicate high energy. What happened the energy of the the other jet? It was most likely used up in collisions in the quark-gluon plasma that came from this lead ion collision.

Credit: ATLAS Experiment© 2010 CERN

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Taken on December 10, 2010