Discriminating new physics scenarios at the Next Linear Collider: The role of polarization

We explore the potential of the Next Linear Collider, operating in the [Formula presented] mode, to disentangle new physics scenarios in single [Formula presented] production. We study the effects related to the exchange of composite fermions in the reaction [Formula presented] and compare them with those arising from trilinear gauge boson anomalous couplings. We stress the role played by the initial state polarization to increase the reach of this machine and to discriminate the possible origin of the new phenomena.