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

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

2008-01-16

arxiv.org/abs/0801.2556v1

Phys.Rev.Lett.99:191802,2007

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 5 figures; updated (published) version of hep-ex/0702005

Scientific paper

10.1103/PhysRevLett.99.191802

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 $\kappauLambda < 0.037 \rm TeV^{-1}$.

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