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The VuQ model involves the addition of a vector isosinglet up-type quark tothe standard model. In this model the full CKM quark mixing matrix is 4 X 3.Using present flavor-physics data, we perform a fit to this full CKM matrix,looking for signals of new physics (NP). We find that the VuQ model is verystrongly constrained. There are no hints of NP in the CKM matrix, and any VuQcontributions to loop-level flavor-changing b -> s, b -> d and s -> dtransitions are very small. There can be significant enhancements of thebranching ratios of the flavor-changing decays t -> u Z and t -> c Z, but theseare still below present detection levels.

New-physics signals of a model with a vector-singlet up-type quark