Search for Narrow t-tbar Resonances in ppbar Collisions at \root{s} = 1.8 TeV

TL;DR

This paper reports a search for narrow resonances decaying into top-antitop pairs in proton-antiproton collisions at 1.8 TeV, setting limits on possible new particles and excluding certain mass ranges.

Contribution

It presents the first limits on narrow t-tbar resonances at this energy, constraining models predicting leptophobic topcolor particles.

Findings

No significant deviation from the standard model observed.

Excluded topcolor particles with mass below 560 GeV/c^2.

Set upper limits on production cross section for various resonance masses.

Abstract

A search for narrow resonances that decay into t-tbar pairs has been performed using 130 pb^{-1} of data in the lepton+jets channel collected in p-pbar collisions at \sqrt{s} = 1.8 TeV. There is no significant deviation observed from the standard model, and upper limits at the 95 % confidence level on the product of the production cross section and branching fraction to t-tbar are presented for narrow resonances as a function of the resonance mass M_X. These limits are used to exclude the existence of a leptophobic topcolor particle with mass M_X < 560 GeV/c^2 and width \Gamma_X = 0.012 M_X.