Single W Boson Production in High Energy e-gamma Collisions

الأصل · EN

We studied single W boson production in high energy eγ collisions and the sensitivity of various observables to the WWγ gauge boson coupling by evaluating the helicity amplitudes of all Feynman diagrams which contribute to the final state being studied, including the W decay to final state fermions. We examined W production at 500 GeV and 1 TeV e+e- colliders, comparing results for photon spectra obtained from a backscattered laser and from beamstrahlung radiation. Here we found that the couplings could best be measured using the backscattered laser photons with |δκγ|≤ 0.07 and |λγ| ≤ 0.05 at a 500 GeV collider and |δκγ|≤ 0.07 and |λγ| ≤ 0.02 at a 1 TeV collider, all at 95% C.L.. The measurement of κγ is at the threshold of being able to measure loop contributions to the trilinear gauge boson vertex. For completeness we include the limits achievable using single W production at a 200 GeV e+e- collider in the Weizacker-Williams approximation. This process can measure κγ to ± 0.15 at 95% C.L. which is comparable to the W pair production process.