Single W Boson Production in High Energy e-gamma Collisions
Loading...
Date
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Description
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 $|δκ_γ|\leq 0.07$ and $|λ_γ| \leq 0.05$ at a 500 GeV collider and $|δκ_γ|\leq 0.07$ and $|λ_γ| \leq 0.02$ at a 1 TeV collider, all at 95% C.L.. The measurement of $κ_γ$ 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 $κ_γ$ to $\pm 0.15$ at 95% C.L. which is comparable to the $W$ pair production process.
Latex file uses revtex version 3, epsfig, and rotate, 13 postscript figures are attached
Latex file uses revtex version 3, epsfig, and rotate, 13 postscript figures are attached