Physics at the e+ e- Linear Collider

Abstract

A comprehensive review of physics at an e + e − Linear Collider in the energy range of √ s = 92 GeV-3 TeV is presented in view of recent and expected LHC results, experiments from low energy as well as astroparticle physics. The report focuses in particular on Higgs boson, top quark and electroweak precision physics, but also discusses several models of beyond the Standard Model physics such as Supersymmetry, little Higgs models and extra gauge bosons. The connection to cosmology has been analyzed as well.

Z polarization in $e^+e^-\to ZWW $ for testing special interactions of massive particles

“…We have made illustrations showing the mentioned effects and their specificities (scale dependent masses, final state interactions) on the p Z distribution of the Z L rate in the e + e − → ZW W process. For experimental possibilities see [15].…”

SUSY Fits and their Implications for ILC and CLIC

“…This offers interesting prospects for the precision determination of the underlying SUSY parameters, see, e.g., Ref. [10]. In the next two subsections we review some more details on the preferred SUSY particle mass ranges as well as on the e + e − production cross sections for electroweak particles.…”

“…In order to confront the parameter space of the Minimal Supersymmetric Standard Model (MSSM) [1][2][3] with experimental data, one can take a purely phenomenological approach in which the soft SUSY-breaking parameters are specified at low energies, and are not required to be universal at any input scale, a class of models referred to as the phenomenological MSSM with n free parameters (pMSSMn) [4]. Here we review a recent exploration of this framework, the pMSSM10 [5,6], in particular in view of the physics at a future e + e − linear collider, such as the ILC [7][8][9][10] or CLIC [10,11].…”

Higgs-Photon Production at Future $e^+e^-$ Colliders

“…If supersymmetry (SUSY) is realized in nature the additional Higgs bosons could be produced at a future e + e − collider such as the ILC [12,13] or CLIC [13,14], or at lower center-of-mass energies at FCC-ee [15] or CEPC [16]. In the case of a discovery of additional Higgs bosons a subsequent precision measurement of their properties will be crucial to determine their nature and the underlying (SUSY) parameters.…”

“…Particularly relevant are higher-order corrections also for the Higgs-boson production at e + e − colliders, where a very high accuracy in the Higgs property determination is anticipated [13]. Available at the full one-loop level within the cMSSM are [34,35]…”