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Search for Production of Single Top Quarks Via tcg and tug Flavor-Changing-Neutral-Current Couplings

Research output: Contribution to journalJournal articlepeer-review

<mark>Journal publication date</mark>6/11/2007
<mark>Journal</mark>Physical review letters
Pages (from-to)191802
Publication StatusPublished
<mark>Original language</mark>English


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 p 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 / and /, where g define the strength of tcg and tug couplings, and defines the scale of new physics. The limits at 95% C.L. are /<0.15 TeV-1 and /<0.037 TeV-1.