Limits on the production of narrow tt resonances in pp collisions at {radical}(s)=1.96 TeV
- Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki (Finland)
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637 (United States)
We search for evidence of resonant top quark pair production in 955 pb{sup -1} of pp collisions at {radical}(s)=1.96 TeV recorded with the CDF II detector at the Fermilab Tevatron. For fully reconstructed candidate tt events triggered on leptons with large transverse momentum and containing at least one identified b-quark jet, we compare the invariant mass spectrum of tt pairs to the expected superposition of standard model tt, non-tt backgrounds, and a simple resonance model based on a sequential Z{sup '} boson. We establish upper limits for {sigma}(pp{yields}Z{sup '}){center_dot}Br(Z{sup '}{yields}tt) in the Z{sup '} mass interval from 450 GeV/c{sup 2} to 900 GeV/c{sup 2}. A topcolor leptophobic Z{sup '} is ruled out below 720 GeV/c{sup 2}, and the cross section of any narrow Z{sup '}-like state decaying to tt is found to be less than 0.64 pb at 95% C.L. for M{sub Z{sup '}} above 700 GeV/c{sup 2}.
- OSTI ID:
- 21249674
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 77, Issue 5; Other Information: DOI: 10.1103/PhysRevD.77.051102; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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