IFIC Seminars - Z’ signals at $e^-e^+$ linear colliders in gauge-Higgs unification

por Yutaka Hosotani (Osaka University)

martes 27 abr. 2021 12:00 → 14:00 Europe/Madrid

In SO(5)xU(1)xSU(3) gauge-Higgs unification (GHU) the 4D Higgs boson is identified with the Aharonov-Bohm phase in the fifth dimension, and is unified with gauge bosons.  The gauge hierarchy problem is naturally solved.  The model yields nearly the same phenomenology  at low energies as the standard model (SM). The model predicts new particles.  In particular Kaluza-Klein excited  states of photon, Z boson and Z_R boson appear as Z’ particles  in the 10 TeV region. There arises large parity violation in the Z’ couplings of leptons and quarks, which leads to distinctive polarization dependence in cross sections, forward-backward asymmetries,and left-right asymmetries in fermion pair production processes in $e^-e^+$ collisions.  Those effects are detectable even for the KK mass scale up to about 15 TeV at future $e^-e^+$ linear collider experiments with energies 250 GeV to 1 TeV. They can be seen in the early stage of the planned 250 GeV ILC.

(Ref: PRD102, 015029 (2020) [arXiv: 2006.02157])

Recorded seminar Valencia2021-hosotani.pdf