We report a search for the flavor changing neutral current
(FCNC) decay of the top quark t --> Zq (q ÿ, c) in p anti-p collisions
at s**(1/2) 1.96 TeV using a data sample corresponding to an integrated
luminosity of 1.9 fb-1 collected by the CDF II detector. This decay
is strongly suppressed in the standard model (SM) and a signal at the
Tevatron would be an indication of physics beyond the SM. Using Z + >
4 jet final state candidate events, both with and without an identified
bottom quark jet, we discriminate signal from background by exploring
kinematic constraints present in FCNC events and obtain an upper limit
of B(t --> Zq) < 3.7% at 95% C.L.
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Updated: Friday, 2008 November 14 15:17:11 CST automatically from input from carol picciolo