SINGLE-TOP-QUARK PRODUCTION VIA Q(Q)OVER-BAR-]T(B)OVER-BAR

We consider single-top-quark production via the weak process <q(q)over bar> --> t (b) over bar at hadron colliders. This process may provide the best measurement of the magnitude of the Cabibbo-Kobayashi-Maskaw a matrix element V-tb. We show that a signal can potentially be observ ed at the Fermilab Tevatron with 3 fb(-1) of integrated luminosity. In contrast, the signal is masked at the CERN Large Hadron Collider by t op-quark pair production and single-top-quark production via W-gluon f usion.