Search for New Heavy Particles Decaying to Z^0 Z^0 -> eeee in p-pbar Collisions at sqrt(s) = 1.96 TeV

TL;DR

This paper reports a search for heavy particles decaying into four electrons via Z^0 bosons in proton-antiproton collisions, setting limits on Randall-Sundrum graviton production with no observed events.

Contribution

First search for heavy particles decaying to four electrons via Z^0 bosons at Tevatron energies, establishing new limits on Randall-Sundrum graviton production.

Findings

No events observed in the mass range 500-1000 GeV/c^2.

Estimated background in the search region is approximately 0.028 events.

Set 95% confidence level limits on cross section times branching fraction for graviton decay.

Abstract

We report the results of a search for the anomalous production of a massive particle decaying to four electrons via two Z^0 bosons in 1.1 fb^{-1} of p-pbar collisions at sqrt(s)=1.96 TeV collected by the CDF II detector at Fermilab. We employ optimized electron identification criteria to maximize acceptance and efficiency. We estimate the backgrounds in the invariant mass range 500 - 1000 GeV/c^2 to be 0.028 +/- 0.009 (stat) +/- 0.011 (syst) events. We observe zero events in this search region. Assuming a Randall-Sundrum graviton production model, we set 95% CL limits on \sigma times BF(G -> Z^0 Z^0) < 4 - 6 pb, depending on the graviton mass.