Signals of additional Z′ boson in e+e− → W+W− at the ILC with polarized beams

• Published in: The journal of high energy physics Vol. 2011; no. 2
• Main Authors: Ananthanarayan, B., Patra, Monalisa, Poulose, P.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.02.2011; Springer Nature B.V
• Subjects: Beams (radiation); Bosons; Classical and Quantum Gravitation; Elementary Particles; Fermions; Fingerprinting; Handedness; High energy physics; Leptons; Neutrinos; Pair production; Physics; Physics and Astronomy; Polarization; Positrons; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Relativity Theory; String Theory; e+−e- Experiments
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP02(2011)043

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 . 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.