Search

We consider an extension of the standard model with an extra neutral gauge bosonV which does not couple to the usual fermions or mix with the standardZ boson. A new fermion, which is either a color-triplet (Q) or a color-singlet (L), and a singlet Higgs scalar (X) are generic particles required for the extension group.V can be produced copiously by the process $$gg \to Q\bar QV$$ . We find 0760 0712 V 3 that there will be at least a few hundredV's produced at the SSC per year if the masses ofV andQ are less than 1 and 0.3 TeV respectively. Although the mixing of the standard and new Higgs scalars is small, the decay of the standard model Higgs scalar,H 1→2V, is comparable to the corresponding standard processes,H 1→2Z. A heavy standard model Higgs may open an important channel for the study of a new neutral gauge boson.

In models where both the electron and muon acquire radiative masses, the same mechanism often allows μ-e transitions as well at a certain level. We discuss the phenomenological constraints on some recently proposed models of this type and show that they are incompatible with present experimental limits on μ→eγ, and in one case also μ→eee, without the fine tuning of parameters which these models are supposed to avoid.