Polarization effects on W boson pair productions with the extra neutral gauge boson at the e^+ e^- Linear Collider

Abstract

We perform the comprehensive analysis of the polarization effects on the e^+e^- -> W^+W^- process in the presence of the extra neutral gauge boson at the LC energies. Consideration of the polarizations of the produced W bosons and the beam polarizations provides substantial enhancements of the sensitivity to the Z-Z' mixing angles in various models and the asymmetry variables also give the strict constraints on the mixing angles. We find that the χ-model and the left-right model get the strict constraint from σ_{LL}^{unpol} while the ψ-model and the η-model from the beam polarization asymmetry.