Identification of extra neutral gauge bosons at the International Linear Collider

Abstract

Heavy neutral gauge bosons, Z's, are predicted by many theoretical schemes of physics beyond the Standard Model, and intensive searches for their signatures will be performed at present and future high energy colliders. It is quite possible that Z's are heavy enough to lie beyond the discovery reach expected at the CERN Large Hadron Collider LHC, in which case only indirect signatures of Z' exchanges may occur at future colliders, through deviations of the measured cross sections from the Standard Model predictions. We here discuss in this context the foreseeable sensitivity to Z's of fermion-pair production cross sections at an e^+e^- linear collider, especially as regards the potential of distinguishing different Z' models once such deviations are observed. Specifically, we assess the discovery and identification reaches on Z' gauge bosons pertinent to the E_6, LR, ALR and SSM classes of models, that should be attained at the planned International Linear Collider (ILC). With the high experimental accuracies expected at the ILC, the discovery and the identification reaches on the Z' models under consideration could be increased substantially. In particular, the identification among the different models could be achieved for values of Z' masses in the discovery (but beyond the identification) reach of the LHC. An important role in enhancing such reaches is played by the electron (and possibly the positron) longitudinally polarized beams. Also, although the purely leptonic processes are experimentally cleaner, the measurements of c- and b-quark pair production cross sections are found to carry important, and complementary, information on these searches.

21 pages

References in corpus (12)

• Improved Constraints on Z' Bosons from Electroweak Precision Data
• ILC Reference Design Report Volume 1 - Executive Summary
• Minimal Z' models: present bounds and early LHC reach
• Z' Phenomenology and the LHC
• Measuring Z' couplings at the LHC
• Identification of Extra Neutral Gauge Bosons at the LHC Using b- and t-Quarks
• Spin and model identification of Z' bosons at the LHC
• Spin identification of the Randall-Sundrum resonance in lepton-pair production at the LHC
• Reconstructing a Z' Lagrangian using the LHC and low-energy data
• Indirect Searches for $Z^{\prime }$-like Resonances at the LHC
• Randall-Sundrum graviton spin determination using azimuthal angular dependence
• Discovery and Identification of Extra Neutral Gauge Bosons at the LHC

Cited by in corpus (16)

• Physics at the e+ e- Linear Collider
• 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
• Diagnosis of a New Neutral Gauge Boson at the LHC and ILC for Snowmass 2013
• Minimal anomalous $\mathrm{U}(1)$ theories and collider phenomenology
• Probing the anomalous triple gauge boson couplings in $e^{+}{e}^{-}\to W^{+}{W}^{-}$ using $W$ polarizations with polarized beams
• Randall-Sundrum graviton spin determination using azimuthal angular dependence
• Forward-backward asymmetry in the gauge-Higgs unification at the International Linear Collider
• Z' boson mass reach and model discrimination at muon colliders
• Signals of additional Z boson in e+e-\to W+W^- at the ILC with polarized beams
• Beam polarization effects on Z-boson pair production at electron-positron colliders: a full one-loop analysis
• Optimal observables for $Z^{\prime }$ models in annihilation leptonic processes
• Sensitivity of a Future High Energy $e^{+}{e}^{-}$ Collider to $Z^{\prime }$ Bosons
• Estimates of Z'couplings within data on the A_{FB} for Drell-Yan process at the LHC at s^(1/2) = 7 TeV and 8 TeV
• The BSM Physics Case of the ILC
• Observables for model-independent detections of Z' boson at the ILC