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Limits on the Production of Narrow t-tbar Resonances in p-pbar Collisions at sqrts=1.96 TeV

CDF Collaboration, and T. Aaltonen. (2007)cite arxiv:0710.5335Comment: 7 Pages, 3 eps Figures; when using dvips use "-t letter -P pdf" option; To be submitted to Phys. Rev. D Rapid Communications.

Abstract

We search for evidence of resonant top quark pair production in 955 pb-1 of p-pbar collisions at sqrts=1.96 TeV recorded with the CDF II detector at the Fermilab Tevatron. For fully reconstructed candidate t-tbar events triggered on leptons with large transverse momentum and containing at least one identified b-quark jet, we compare the invariant mass spectrum of t-tbar pairs to the expected superposition of standard model t-tbar, non-t-tbar backgrounds, and a simple resonance model based on a sequential Z' boson. We establish upper limits for sigmap-pbar to Z' times BrZ' to t-tbar in the Z' mass interval from 450 GeV/c2 to 900 GeV/c2. A topcolor leptophobic Z' is ruled out below 720 GeV/c2, and the cross section of any narrow Z'-like state decaying to t-tbar is found to be less than 0.64 pb at 95% C.L. for MZ' above 700 GeV/c2.

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Limits on the Production of Narrow t-tbar Resonances in p-pbar Collisions at sqrt(s)=1.96 TeV

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