The interesting fluctuations seen at the Tevatron and the LHC are dominated by what might be the Higgs decaying into a pair of "W boson" particles.

BBC: Higgs boson 'hints' also seen by US lab

Without it, or something like it, some of the Standard Model's particles that actually do have mass (particularly the W and Z bosons) would be predicted to be massless.

ECONOMIST: The Higgs boson: Fantasy turned reality | The

The Standard Model (see table) includes familiar particles such as electrons and photons, and esoteric ones like the W and Z bosons, which carry something called the weak nuclear force.

ECONOMIST: The Higgs boson