A superstring Z' boson in radiative electron-positron annihilation

The radiative electron-positron annihilation e-e+ → γX is studied in the SU(2) x U(1) and SU(2) x U(1) x U'(1) gauge models. The effective cross section and various polarization characteristics [such as right-left asymmetry ARL, the effect N(λ2) of positron-beam polarization, and the degree P of photon polarization] are expressed in terms of structure functions for arbitrary polarizations of the electron-positron pair and the circular polarization of photons. Structure functions are found for the processes e-e+ → γf bar f, e-e+ → γ + hadrons, e-e+ → γ bar f bar f, e-e+ → γH+H-, e-e+ → γHsoHpo, e-e+ → γ bar H+bar H, and e-e+ → γ bar Hso bar Hpo, and electroweak asymmetries are analyzed in detail. The study of polarization characteristics of the processes e-e+ → γX is shown to provide valuable information about the properties of an extra superstring Z' boson. 30 refs., 6 figs