Search for t \overlinet Resonances at DØ

Details Search for t \overlinet Resonances at DØ Search for t \overlinet Resonances at DØ

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprk14012j&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

We use approximately 125 pb-1 of pbarp collision data collected with the DØdetector at Fermilab from 1992-1996 at a center of mass energy of √s = 1.8 TeV, to search for a non-standard model narrow vector particle, X, decaying to a top and an anti-top quark. We assume that each top quark decays into a W boson and a bottom quark. We then consider the event topology in which one of the W bosons decays leptonically and the other decays hadronically. The resulting final state consists of a high transverse momentum isolated lepton, large missing transverse energy and at least 4 jets. In the absence of any significant excess above standard-model expectations in data , we present model-independent 95% confidence level upper limits on the cross section for the narrow, vector resonance decaying to tbart. Using a model of topcolor-assisted technicolor, we then exclude the existence of a leptophobic X boson with a mass < 600 GeV/c^2 for natural width ΓX = 0.012 M_X.

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