CMS: dimuon decay of a Z

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    Two muons (red tracks) depart from a single vertex, seen in two views. Measurement of the energies and momenta of the muons indicates that they came from the decay of a particle of mass 85.5 GeV. This is close to the mass of a Z boson; what's more, we know from previous experiments that the Z can decay into a positive and a negative muon, making this a good candidate for just such an event.
    Copyright CERN for the benefit of the CMS Collaboration

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