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We present a search for a new particle T' decaying to a top quark via T' -> t+ X, where X goes undetected. We use a data sample corresponding to 5.7 fb-1 ofintegrated luminosity of ppbar collisions with sqrt{s} = 1.96 TeV, collected atFermilab by the CDF II detector. Our search for pair production of T' isfocused on the hadronic decay channel, ppbar -> T'T' -> tt +XX -> bbqqqq + XX.We interpret our results in terms of a model where T' is an exotic fourthgeneration quark and X is a dark matter candidate. The data are consistent withstandard model expectations. We set a limit on the generic production ofT'T'->tt+XX, excluding the fourth generation exotic quarks T' at 95% confidencelevel up to m_T' = 400 GeV/c2 for m_X < 70 GeV/c2.

physical review letters

Search for New $T^\prime$ Particles in Final States with Large Jet  Multiplicities and Missing Transverse Energy in ppbar Collisions at sqrt(s) =  1.96 TeV