Search for a new Resonance decaying into Top-Antitop at Tevatron

TL;DR

This paper reports a search for a new heavy resonance decaying into top-antitop pairs at the Tevatron, setting limits on certain models due to no observed signal in the data.

Contribution

First search for a narrow-width resonance decaying into top-antitop pairs at the Tevatron using the D0 detector data.

Findings

No evidence for ttbar resonance found

Excluded Z' boson masses below 680 GeV at 95% CL

Set upper limits on production cross section times branching ratio

Abstract

In this report a new search for a narrow-width heavy resonance decaying into top quark pairs (X -> ttbar) in ppbar collisions at sqrt(s)=1.96 TeV has been performed using data collected by the D0 detector at the Fermilab Tevatron collider. The analysis considers ttbar candidate events in the lepton+jets channel using a lifetime tag to identify b-jets and the ttbar invariant mass distribution to search for evidence of resonant production. The analyzed dataset corresponds to an integrated luminosity of approximately 370 pb^-1. Since no evidence for a ttbar resonance X is found, upper limits on sigma(X) x B(X -> ttbar) for different hypothesized resonance masses using a Bayesian approach are set. Within a topcolor-assisted technicolor model, the existence of a leptophobic Z' boson with M(Z') < 680 GeV and width Gamma(Z') = 0.012 M(Z') can be excluded at 95% C.L..