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Easy to Detect when Higgs decays to Z + Z
Z bosons also have several decay modes, including Z → e+ + e- and Z → µ+ + µ-
The Z + Z decay mode is quite easy for the ATLAS and CMS experiments to detect when both the Z bosons decay into one of these two modes (Z → e+ e- or Z → µ+ µ- ). Then the four observed decay modes of the Higgs boson are:
The end result is that one will sometimes see (in addition to some unrelated particles) four muons, or, four electrons, or two muons and two electrons.