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

Abstract : We search for the production of single top quarks via flavor-changing neutral current 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 $\ppbar$ collisions at a center of mass energy of 1.96 TeV collected by the D0 detector at the Fermilab Tevatron Collider. We observe no significant deviation from standard model predictions, and hence set upper limits on the anomalous coupling parameters $\kappacLambda$ and $\kappauLambda$, where $\kappag$ define the strength of $tcg$ and $tug$ couplings, and $\Lambda$ defines the scale of new physics. The limits at 95% C.L. are: $\kappacLambda < 0.15 \rm TeV^{-1}$ and $\kappauLambda < 0.037 \rm TeV^{-1}$.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00206413
Contributor : Emmanuelle Vernay <>
Submitted on : Thursday, January 17, 2008 - 10:16:29 AM
Last modification on : Sunday, June 20, 2021 - 3:34:54 AM

### Citation

V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, et al.. Search for production of single top quarks via $tcg$ and $tug$ flavor-changing neutral current couplings. Physical Review Letters, American Physical Society, 2007, 99, pp.191802. ⟨10.1103/PhysRevLett.99.191802⟩. ⟨in2p3-00206413⟩

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