Search for tt resonances in the lepton plus jets final state in pp collisions at √s = 1.96 TeV

Authors

V. M. Abazov, Joint Institute for Nuclear Research, Dubna, Russia
Kenneth A. Bloom, University of Nebraska-LincolnFollow
Gregory Snow, University of Nebraska-LincolnFollow
DØ Collaboration

Document Type

Article

Date of this Version

August 2008

Comments

Published by Physics Letters B 668 (2008) 98–104.

Abstract

We present a search for a narrow-width heavy resonance decaying into top quark pairs (X →tt) in p p collisions at √s = 1.96 TeV using approximately 0.9 fb⁻¹ of data collected with the DØ detector at the Fermilab Tevatron Collider. This analysis considers tt candidate events in the lepton plus jets channel with at least one identified b jet and uses the tt invariant mass distribution to search for evidence of resonant production. We find no evidence for a narrow resonance X decaying to tt. Therefore, we set upper limits on σX • B (X →tt) for different hypothesized resonance masses using a Bayesian approach. For a Topcolor-assisted technicolor model, the existence of a leptophobic Z′ boson with mass M_Z′ < 700 GeV and width Γ_Z′ = 0.012 M_Z′ can be excluded at the 95% C.L.