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We search for the production of single top quarks via flavor-changing neutralcurrent couplings of a gluon to the top quark and a charm ($c$) or up ($u$)quark. We analyze 230 pb$^{-1}$ of lepton + jets data from $\ppbar$ collisionsat a center of mass energy of 1.96 TeV collected by the D0 detector at theFermilab Tevatron Collider. We observe no significant deviation from standardmodel predictions, and hence set upper limits on the anomalous couplingparameters $\kappacLambda$ and $\kappauLambda$, where $\kappag$ define thestrength of $tcg$ and $tug$ couplings, and $\Lambda$ defines the scale of newphysics. The limits at 95% C.L. are: $\kappacLambda < 0.15 \rm TeV^{-1}$ and$\kappauLambda < 0.037 \rm TeV^{-1}$.

Search for production of single top quarks via $tcg$ and $tug$ flavor-changing neutral current couplings