Editing Elementary particle (section)

=== Grand unification ===
{{Main|Grand Unified Theory}}

One extension of the Standard Model attempts to combine the [[electroweak interaction]] with the [[strong interaction]] into a single 'grand unified theory' (GUT). Such a force would be [[spontaneous symmetry breaking|spontaneously broken]] into the three forces by a [[Higgs mechanism|Higgs-like mechanism]]. This breakdown is theorized to occur at high energies, making it difficult to observe unification in a laboratory. The most dramatic prediction of grand unification is the existence of [[X and Y bosons]], which cause [[proton decay]]. The non-observation of proton decay at the [[Super-Kamiokande]] neutrino observatory rules out the simplest GUTs, however, including SU(5) and SO(10).