Fig. 2: Higgs production at the LHC.
a, Illustration of one process for the production and decay of a Higgs boson at the LHC. b, Total centre-of-mass energy of four leptons (4l; electrons and/or muons and their antiparticles) from the CMS experiment; the peak around 125 GeV corresponds to decays of Higgs bosons, whereas the peak near 91.2 GeV corresponds to decays of single Z bosons (not Higgs-induced), adapted from ref. 95. The decay to Z bosons was one of the channels used for the discovery of the Higgs boson, with the other important discovery channels being the decay to two W bosons and that to two photons (the latter proceeds through a quantum fluctuation with top quarks and W bosons).
