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

Abstract

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 $t\to Wb$, the minimum scale at which new physics can strongly modify the t-c-g coupling is \Ltcg $\ge$ about 950 GeV. At the upgraded Tevatron, single top production can constrain \Ltcg $\ge$ 4.5 TeV. The connection between t-c production and the decay $t\to cg$ is examined, showing how constraints on one lead to a constraint on the other.

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