In theories with an extra U(1) gauge boson ($Z_2$) at low energies, W-boson pairs may be produced copiously by the process $e^{+}$$e^{\mathrm{-}}$→$Z_2$→$W^{+}$$W^{\mathrm{-}}$ at the $Z_2$ resonance. We show that the angular distribution of the W pairs (produced at the $Z_2$ resonance) is very different from that in the standard model, at the same center-of-mass energy, where it is dominated by t-channel neutrino exchange. These distributions will also be useful in distinguishing between the various models containing an extra Z boson.

• Received 5 June 1987

DOI:https://doi.org/10.1103/PhysRevD.37.52