General analysis ofZ0decays into lepton pairs and spin-0 bosons

We present a general analysis of $Z^0$ decay into a dilepton pair and a spin-0 particle. Three cases are investigated: the Weinberg-Salam $0^{+}$ Higgs boson, the hypercolor $0^{-}$ bosons, and composite $0^{+}$ and $0^{-}$ Higgs bosons coupling to composite vector bosons. The density distribution in the two lepton energies, the individual lepton energy spectra, and the distribution in dilepton invariant mass are given. We find the standard Higgs boson to be distinguishable from the other cases studied and also less affected by the main sources of background.