" For 10 points, name this particle, the only Standard Model particle yet to be observed.
This particle serves as a mediator in the quantum field with which it shares its name, whose nonzero vacuum expectation value allows symmetry breaking. Its mass is estimated to be approximately 140 times that of a proton, has spin zero, and explains the difference between the W and Z bosons and the (*) massless photon, as it is thought to give mass to the gauge photons. The Large Hadron Collider was designed to search for this particle, sometimes called the "God particle." For 10 points, name this particle, the only Standard Model particle yet to be observed.
This particle serves as a mediator in the quantum field with which it shares its name, whose nonzero vacuum expectation value allows symmetry breaking.
{Higgs} boson