Extensions of the Standard Model
The Standard Model (SM) of particle physics successfully incorporates all known properties of the strong, weak, and electromagnetic interactions. The experimental evidence for neutrino oscillations [Fu98, Cl98a, Ma00a] can be accommodated within the SM by adding right-handed neutrinos. If the neutrinos are of Majorana type and violate lepton number, a Higgs singlet field is needed in addition. Apart from the neutrino oscillation phenomena, there is no compelling experimental result that contradicts the predictions of the Standard Model. However, many of the consequences of the theory have not yet been experimentally verified or remain to be worked out further, like the mass-generation mechanism or the strong-coupling regime of QCD.
KeywordsGauge Theory Higgs Boson Gauge Group Gauge Boson Yukawa Coupling
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