ABSTRACT
The standard model of the strong and the electroweak interactions is a spontaneously broken gauge theory with at least 18 parameters. During the electroweak phase transition, the Higgs doublet φ acquires a vev breaking the symmetry group
SU(3)c×SU(2)L×U(1)Y mW−→ SU(3)c×U(1)Q . The gauge coupling constants corresponding to the three groups, g3,g2 and gY are three parameters of the theory. Other parameters include the six quark masses, three mixing angles, and one CP violating phase in the quark mixing matrix appearing in the charged currents, three charged lepton masses and the mass and the quartic coupling constant of the Higgs scalar. When the standard model is extended to include neutrino masses, the number of free parameters becomes 27. The additional parameters are three neutrino masses, three mixing angles, and one CP phase in the leptonic sector. If neutrinos are Majorana particles, there will be two additional Majorana CP phases.
