Single Top Production in $e\gamma$ Collisions

We study single top production in high energy $e\gamma$ collisions. The process $e\gamma \to \nu b\bar{t}$ can serve as a unique tool for measuring the $Wtb$ coupling. We show that allowing for realistic luminosity and backgrounds, the size of this coupling can be determined to within 10 (5)% in an $e\gamma$ collider built around a 500 (1000) GeV $e^{+}{e}^{-}$ collider.