Search for Production of Single Top Quarks Via tcg

GUSTAVO OTERO Y GARZON, THE DZERO COLLABORATION

PHYSICAL REVIEW LETTERS

Año: 2007 p. 1918021 - 1918025

0031-9007

We search for the production of single top quarks via flavor-changing-neutral-current couplings of agluon to the top quark and a charm (c) or up (u) quark. We analyze 230 pb
1 of lepton  jets data frompp
collisions at a center of mass energy of 1.96 TeV collected by the D0 detector at the Fermilab TevatronCollider. We observe no significant deviation from standard model predictions, and hence set upper limitson the anomalous coupling parameters
cg= and
ug=, where
g define the strength of tcg and tugcouplings, and  defines the scale of new physics. The limits at 95% C.L. are
cg= < 0:15 TeV
1 and
ug= < 0:037 TeV
1.