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

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

2006-02-28

arxiv.org/abs/hep-ex/0602048v1

Pos HEP2005:349,2006

Physics

High Energy Physics

High Energy Physics - Experiment

Talk given at the "International Europhysics Conference on High Energy Physics", July 21st - 27th 2005, Lisboa, Portugal

Scientific paper

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..

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