Measurement of the [formula presented] coupling in the process [formula presented] off the W-boson resonance

We study the (Formula presented) gauge boson coupling in the process (Formula presented) off the W-boson resonance by evaluating the helicity amplitudes of all contributing Feynman diagrams. We examine this process for 500 GeV and 1 TeV (Formula presented) colliders including the photon spectra obtained from both a backscattered laser and from beamstrahlung radiation. The couplings could best be measured using the backscattered laser photons with (Formula presented) and (Formula presented) at a 500 GeV collider and (Formula presented) at a 1 TeV collider, all at 95% C.L. Except for the relatively weak limits on (Formula presented) at (Formula presented) these sensitivities are the same order of magnitude as can be obtained from real single W-production demonstrating that additional information can be obtained from non-resonant final states.