We search for resonant production of tt̅ pairs in 4.8 fb-1
integrated luminosity of pp̅ collision data at √s=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 of the tt̅ candidate
invariant mass is sampled. These probability density functions are
used to construct a likelihood function, whereby the cross section for
resonant tt̅ production is estimated, given a hypothetical resonance
mass and width. The data indicate no evidence of resonant production
of tt̅ pairs. A benchmark model of leptophobic Z′→tt̅ is excluded
with mZ′<900 GeV/c2 at 95% confidence level.
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Updated: Thursday, 2012 January 26 15:59:02 CST automatically from input from "Stephanie A. Schuler"