Signals of additional Z boson in e+e-\to W+W^- at the ILC with polarized beams

Abstract

We consider the possibility of fingerprinting the presence of heavy additional Z' bosons that arise naturally in extensions of the standard model such as E_6 models and left-right symmetric models, through their mixing with the standard model Z boson. By considering a class of observables including total cross sections, energy distributions and angular distributions of decay leptons we find significant deviation from the standard model predictions for these quantities with right-handed electrons and left-handed positrons at \sqrt{s}=800 GeV. The deviations being less pronounced at smaller centre of mass energies as the models are already tightly constrained. Our work suggests that the ILC should have a strong beam polarization physics program particularly with these configurations. On the other hand, a forward backward asymmetry and lepton fraction in the backward direction are more sensitive to new physics with realistic polarization due to interesting interplay with the neutrino t- channel diagram. This process complements the study of fermion pair production processes that have been considered for discrimination between these models.

23 pages, 9 figures, uses plain latex; substantially improved discussion, references added, version accepted for publication in JHEP

References in corpus (6)

• ILC Reference Design Report Volume 1 - Executive Summary
• Z' physics with early LHC data
• Z'_{B-L} discovery potential at the LHC for \sqrt{s}=7 TeV
• Z' Phenomenology and the LHC
• Spin and model identification of Z' bosons at the LHC
• Spin identification of heavy nonstandard bosons in dilepton and diphoton events at the LHC

Cited by in corpus (6)

• On the choice of beam polarization in $e^{+}{e}^{-}\to ZZ/Z\gamma$ and anomalous triple gauge-boson couplings
• Discriminating Z' from anomalous trilinear gauge coupling signatures in e+e- \to W+W- at ILC with polarized beams
• Precise determination of Z-Z' mixing at the CERN LHC
• Probing the anomalous triple gauge boson couplings in $e^{+}{e}^{-}\to W^{+}{W}^{-}$ using $W$ polarizations with polarized beams
• Probing strongly interacting W's at the ILC with polarized beams
• Study of anomalous gauge boson self-couplings and the role of spin-$1$ polarizations