Search for a Narrow ttbar Resonance in ppbar Collisions at sqrt{s}=1.96 TeV

TL;DR

This paper reports a search for a narrow top-antitop resonance in proton-antiproton collisions at 1.96 TeV, setting limits on its production and excluding certain mass ranges.

Contribution

First search for a narrow ttbar resonance at Tevatron energies, providing upper limits and excluding masses below 835 GeV for a leptophobic Z' boson.

Findings

Excluded resonance masses below 835 GeV at 95% confidence level.

Set upper limits on production cross section times branching fraction.

Compared results to leptophobic topcolor Z' boson predictions.

Abstract

We report a search for a narrow ttbar resonance that decays into a lepton+jets final state based on an integrated luminosity of 5.3/fb of proton-antiproton collisions at sqrt{s}=1.96 TeV collected by the D0 Collaboration at the Fermilab Tevatron Collider. We set upper limits on the production cross section of such a resonance multiplied by its branching fraction to ttbar which we compare to predictions for a leptophobic topcolor Z' boson. We exclude such a resonance at the 95% confidence level for masses below 835 GeV.