termed in the literature the Brout–Englert–Higgs, BEH or Brout–Englert–Higgs–Hagen–Guralnik–Kibble mechanism after its original proposers [ 7 ] )—the mechanism by which elementary particles are given mass . [ Note 2 ] While the Higgs mechanism is considered confirmed to exist, the boson itself—a cornerstone of the leading theory—had not been observed