In gauge-Higgs unification (GHU), the 4D Higgs boson appears as a part of the fifth dimensional component of 5D gauge field. Recently, an $SO(11)$ GUT inspired $SO(5)\times U(1)\times SU(3)$ GHU model has been proposed. In the GHU, Kaluza-Klein (KK) excited states of neutral vector bosons, photon, $Z$ boson and $Z_R$ boson, appear as neutral massive vector bosons $Z'$s. The $Z'$ bosons in the...
The process ee->qq (with q from u to top) plays a central role in the physics programs of high energy electron-positron colliders operating from the O(100GeV) to O(1TeV) center of mass energies. Furthermore, polarised beams as available at the International Linear Collider (ILC) are an essential input for the complete measurement of the helicity amplitudes that govern the production cross...
Linear Colliders with polarised beams provide unique opportunities to measure the helicity structure of the process ee->qq and to discover the onset of new physics.
This talk presents the status of a detailed simulation study of the process ee->ss based on the ILD concept. Particle identification of final state Kaons plays plays a crucial role for the success of the measurement and will be at...
One of the important goals at the future $e^+ e^−$ colliders is to measure the top-quark mass and width in a scan of the pair production threshold. However, the shape of the pair-production cross section at the threshold depends also on other model parameters, as the top Yukawa coupling, and the measurement is a subject to many systematic uncertainties. Presented in this work is the study of...
We present a new measurement of the bottom quark mass based on the determination of Higgs decay rates to bottom quarks. The current measurements by ATLAS and CMS yield a value for the bottom quark at the scale of the Higgs boson mass mb(mH) = 2.6 GeV, with an uncertainty of less than 15%. The theory uncertainty has been investigated in detail and is found to be a fraction of the current...
