CMS sees Z's in collisions of Pb

CMS has an important first: detection and measurement of decays that appear to be from Z bosons inside the primordial fireballs that result from lead ion collisions. Here, two electrons emerge from the quark-gluon plasma and deposit their energy in the electromagnetic calorimeter. The tall red tower in the lower left of the image and the shorter red double tower on the upper right indicate an electron-positron pair that can be reconstructed to have come from a single Z-boson candidate.

Credit: Copyright CERN on behalf of the CMS Collaboration.

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Taken on December 17, 2010