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

TL;DR

This paper reports a search for heavy particles like technirho, techniomega, and Z' decaying into electron-positron pairs using Fermilab Tevatron data, setting mass exclusion limits in the absence of signals.

Contribution

First search for these particles in the e+e- decay channel at Fermilab, establishing new mass exclusion limits based on 124.8 pb-1 of data.

Findings

Excluded technirho and techniomega below ~200 GeV

Excluded Z' below 670 GeV with Standard Model-like couplings

No evidence of heavy particles in the analyzed data

Abstract

We present results of searches for technirho, techniomega, and Z' particles, using the decay channels technirho, techniomega, Z' -> e+e-. The search is based on 124.8 pb-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 p pbar -> technirho, techniomega, Z' -> e+e- as a function of the mass of the decaying particle. For certain model parameters, we exclude the existence of degenerate technirho and techniomega 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.