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Title

Limits on the production of narrow tt resonances in pp collisions at s√=1.96  TeV

CollaborationWith : Clark, Allan Geoffrey / Hamilton, Andrew / Lefevre, Régis / Sfyrla, Anna / Shreyber, Irina / Vallecorsa, Sofia / Wu, Xin
Published in Physical review. D. Particles, fields, gravitation, and cosmology. 2008, vol. 77, no. 05, 051102
Abstract We search for evidence of resonant top quark pair production in 955 pb−1 of pp collisions at 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′ boson. We establish upper limits for σ(pp→Z′)⋅Br(Z′→tt) 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 tt is found to be less than 0.64 pb at 95% C.L. for MZ′ above 700  GeV/c2.
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CDF COLLABORATION. Limits on the production of narrow tt resonances in pp collisions at s√=1.96  TeV. In: Physical review. D. Particles, fields, gravitation, and cosmology, 2008, vol. 77, n° 05, p. 051102. doi: 10.1103/PhysRevD.77.051102 https://archive-ouverte.unige.ch/unige:38477

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Deposited on : 2014-07-07

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