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Phys. Rev. D 77, 051102(R) (2008) [7 pages]

Limits on the production of narrow tt̅ resonances in pp̅ collisions at s=1.96  TeV

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T. Aaltonen et al. CDF Collaboration
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Received 30 October 2007; published 12 March 2008

We search for evidence of resonant top quark pair production in 955 pb-1 of pp̅ collisions at s=1.96  TeV recorded with the CDF II detector at the Fermilab Tevatron. For fully reconstructed candidate tt̅ events triggered on leptons with large transverse momentum and containing at least one identified b-quark jet, we compare the invariant mass spectrum of tt̅ pairs to the expected superposition of standard model tt̅ , non-tt̅ backgrounds, and a simple resonance model based on a sequential Z boson. We establish upper limits for σ(pp̅ →ZBr(Ztt̅ ) 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 tt̅ is found to be less than 0.64 pb at 95% C.L. for MZ above 700  GeV/c2.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.77.051102
DOI:
10.1103/PhysRevD.77.051102
PACS:
13.85.Rm, 14.65.Ha, 14.80.−j