A search for resonant production of $tt$ pairs in $4.8\ fb^-1$ of integrated luminosity of $pp$ collisions at $s=1.96\ TeV$

CDF Collaboration. (2011)cite arxiv:1107.5063Comment: accepted for publication in Physical Review D Sep 21, 2011.


We search for resonant production of tt pairs in 4.8 fb^-1 integrated luminosity of ppbar collision data at sqrts=1.96 TeV in the lepton+jets decay channel, where one top quark decays leptonically and the other hadronically. A matrix element reconstruction technique is used; for each event a probability density function (pdf) of the ttbar candidate invariant mass is sampled. These pdfs are used to construct a likelihood function, whereby the cross section for resonant ttbar production is estimated, given a hypothetical resonance mass and width. The data indicate no evidence of resonant production of ttbar pairs. A benchmark model of leptophobic Z \rightarrow ttbar is excluded with m_Z' < 900 GeV at 95% confidence level.


A search for resonant production of $t\bar{t}$ pairs in $4.8\ \rm{fb}^{-1}$ of integrated luminosity of $p\bar{p}$ collisions at $\sqrt{s}=1.96\ \rm{TeV}$

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