Anomalous t-c-g coupling: The connection between single top quark production and top quark decay

Continuing earlier work, we examine the constraint on an anomalous t-c-g coupling from top quark decay. We find that from current CDF measurements of the branching ratio t --> Wb, the minimum scale at which new physics can strongly modify the t-c-g coupling is Lambda(tcg) greater than or equal to about 950 GeV. At the upgraded Fermilab Tevatron, single top quark production can constrain Lambda(tcg) greater than or equal to 4.5 TeV. The connection between t-c production and the decay t --> cg is examined, showing how constraints on one lead to a constraint on the other.