Fermion pair production at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math> linear collider experiments in GUT inspired gauge-Higgs unification
Shuichiro Funatsu, Hisaki Hatanaka, Yutaka Hosotani, Yuta Orikasa, Naoki Yamatsu
Abstract
Fermion pair production at ${e}^{\ensuremath{-}}{e}^{+}$ linear collider experiments with polarized ${e}^{\ensuremath{-}}$ and ${e}^{+}$ beams is examined in the GUT inspired $SO(5)\ifmmode\times\else\texttimes\fi{}U(1)\ifmmode\times\else\texttimes\fi{}SU(3)$ gauge-Higgs unification. There arises large parity violation in the couplings of leptons and quarks to Kaluza-Klein (KK) excited neutral vector bosons ${Z}^{\ensuremath{'}}\mathrm{s}$, which leads to distinctive polarization dependence in cross sections, forward-backward asymmetries, left-right asymmetries, and left-right forward-backward asymmetries in various processes. Those effects are detectable even for the KK mass scale up to about 15 TeV at future ${e}^{\ensuremath{-}}{e}^{+}$ linear collider experiments with energies 250 GeV to 1 TeV.