arXiv:hep-ph/9505433v1 31 May 1995 DTP/95/40 ILL-(TH)-95-30 hep-ph/9505433 May 1995 Single-top-quark production via q ¯ q → t ¯ b T. Stelzer Department of Physics University of Durham Durham DH1 3LE England S. Willenbrock Department of Physics University of Illinois 1110 West Green Street Urbana, IL 61801 Abstract We consider single-top-quark production via the weak process q ¯ q → t ¯ b at hadron colliders. This process may provide the best measurement of the magnitude of the Cabbibo-Kobayashi-Maskawa matrix element V tb . We show that a signal can poten- tially be observed at the Fermilab Tevatron with 3 fb -1 of integrated luminosity. In contrast, the signal is masked at the CERN Large Hadron Collider by top-quark pair production and single-top-quark production via W -gluon fusion. 1