ATLAS catches a Z

In this ATLAS 7 TeV event display, two straight tracks in the tracker (prominent yellow lines) indicate two energetic particles coming from the decay of an object made in the proton-proton collision. These tracks end as yellow splotches where the particles deposit all their energy in the electromagnetic calorimeter (green area); these deposits are seen as yellow towers in the "lego plot" at the top right. The reconstructed mass of 89 GeV is close enough to the accepted mass of the Z boson to declare the "object" to be a good candidate for a Z, which has decayed into an electron and a positron.

Copyright 2010 The ATLAS Experiment at CERN Collaboration

 

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Taken on June 24, 2010