Search for heavy particles decaying into electron-positron pairs in pp̅ collisions

Abstract

We present results of searches for technirho (ρ_T), techniomega (ω_T), and Z' particles, using the decay channels ρ_T,ω_T,Z'→e⁺e^-. The search is based on 124.8pb^-1 of data collected by the D0 detector at the Fermilab Tevatron during 1992-1996. In the absence of a signal, we set 95% C.L. upper limits on the cross sections for the processes pp̅→ρ_T,ω_T,Z'→e⁺e^- as a function of the mass of the decaying particle. For certain model parameters, we exclude the existence of degenerate ρ_T and ω_T states with masses below about 200 GeV. We exclude a Z' with mass below 670 GeV, assuming that it has the same couplings to fermions as the Z boson.