arXiv subjects
Publications and source records attributed to Stephen Godfrey.
In this version we have corrected some minor errors in the tables, corrected typos, and added a reference. We have also updated our comparison with earlier workers. Figures are now included as uuencoded compressed tar files.
We studied single $W$ boson production in high energy $eγ$ collisions and the sensitivity of various observables to the $WWγ$ vertex. We included gauge boson decay to final state fermions and all contributions to the same final state. The contributions of the non-resonant diagrams and their interference with the resonant gauge boson production diagrams give significant contributions which should not be neglected. We present results for $W$ production at a 500 GeV $e^+e^-$ collider with the photon spectra obtained from a backscattered laser.
We studied single $W$ boson production in high energy $eγ$ collisions and the sensitivity of various observables to the $WWγ$ gauge boson coupling. We evaluated the helicity amplitudes including the $W$ decay to final state fermions and all Feynman diagrams which give the same final state. At high energy, the non-resonant diagrams give significant contributions to the cross sections and should not be neglected. We first considered a $\sqrt{s}=120$~GeV $e^+e^-$ collider converted to an $eγ$ collider by backscattering a low energy laser off of one of the original electron beams. Such a collider could measure $κ_γ$ to $\simeq\pm 0.09$ at 95\% C.L. which is the same level of precision as could be achieved at LEP200 using $W$ pair production. We next considered single $W$ production at a 200 GeV $e^+e^-$ collider in the Weizacker-Williams approximation which can measure the $WWγ$ vertex independently of the $WWZ$ vertex. This process can measure $κ_γ$ to $\pm 0.15$ at 95\% C.L. which is comparable to the $W$ pair production process. Finally, 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
We study the potential for using $eγ$\ collisions produced by backscattered laser photons to investigate WW$γ$\ couplings. We present results for Next Linear Collider energies of 500 GeV and 1 TeV. We find that where statistics allow, off W mass shell results can be quite important, complementing on W mass shell results from this and other studies. It is shown that $eγ$\ colliders would prove quite valuable in the investigations of W-boson physics.