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Title
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Limits on the production of narrow resonances in collisions at =1.96 TeV
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Author
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Abstract
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| 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 →Z′)·Br(Z′→tt̅ ) 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. |
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Language
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English
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Source (journal)
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Physical review : D : particles, fields, gravitation, and cosmology / American Physical Society. - Ridge, N.Y., 2004 - 2015
Physical review : D : particles and fields. - Lancaster, Pa, 1970 - 2003
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Publication
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Ridge, N.Y.
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American Physical Society
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2008
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ISSN
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1550-7998
[print]
1550-2368
[online]
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DOI
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10.1103/PHYSREVD.77.051102
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Volume/pages
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77
:5
(2008)
, p. 051102,1-051102,7
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ISI
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000254544200002
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Full text (Publisher's DOI)
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Full text (open access)
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