Single Top Quark Production via FCNC Couplings at Hadron Colliders

Abstract

We calculate single top-quark production at hadron colliders via the chromo-magnetic flavor-changing neutral current couplings $\bar{t}cg$ and $\bar{t}ug$. We find that the strength for the anomalous $\bar{t}cg$ ($\bar{t}ug$) coupling may be probed to $\hat{I}{º}_c/\hat{I}›=0.092{TeV}^{-1}$ ($\hat{I}{º}_u/\hat{I}›=0.026{TeV}^{-1}$) at the Tevatron with $2{fb}^{-1}$ of data and $\hat{I}{º}_c/\hat{I}›=0.013{TeV}^{-1}$ ($\hat{I}{º}_u/\hat{I}›=0.0061{TeV}^{-1}$) at the LHC with $10{fb}^{-1}$ of data. The two couplings may be distinguished by a comparision of the single top signal with the direct top and top decay signals for these couplings.

18 pages, 6 figures, 3 tables