  We provide a framework for the analysis of the W boson helicity in the decay
of the top quark that is based on a general effective tbW coupling. Four
independent coupling coefficients can be uniquely determined by the fractions
of longitudinal and transverse W boson polarizations as well as the single top
production rates for the t-channel and the s-channel processes. The knowledge
of these coefficients can be used to discriminate models of electroweak
symmetry breaking.

High Energy Physics - Phenomenology