Search for a heavy neutral gauge boson in the dielectron channel with 5.4 fb-1 of ppbar collisions at sqrt(s) = 1.96 TeV

TL;DR

This study searches for a hypothetical heavy neutral gauge boson Z' decaying into dielectrons using 5.4 fb-1 of proton-antiproton collision data, finding no evidence and setting mass limits within various theoretical models.

Contribution

First search for Z' bosons in the dielectron channel with this dataset, providing new mass exclusion limits across multiple models.

Findings

No significant excess observed in dielectron invariant mass spectrum.

Set 95% C.L. upper limits on production cross section times branching ratio.

Established lower mass limits for Z' bosons in different theoretical frameworks.

Abstract

We report the results of a search for a heavy neutral gauge boson Z' decaying into the dielectron final state using data corresponding to an integrated luminosity of 5.4 fb-1 collected by the D0 experiment at the Fermilab Tevatron Collider. No significant excess above the standard model prediction is observed in the dielectron invariant-mass spectrum. We set 95% C.L. upper limits on \sigma (ppbar -> Z') X BR(Z' -> ee) depending on the dielectron invariant mass. These cross section limits are used to determine lower mass limits for Z' bosons in a variety of models with standard model couplings and variable strength.