There are lots of new physics models which predict an extra neutral gauge boson, referred as Z -boson. In a certain class of these new physics models, the Z -boson has flavor-dependent couplings with the fermions in the Standard Model (SM). Based on a simple model in which couplings of the SM fermions in the third generation with the Z -boson are different from those of the corresponding fermio...

There are lots of new physics models which predict an extra neutral gauge boson, referred as Z -boson. In a certain class of these new physics models, the Z -boson has flavor-dependent couplings with the fermions in the Standard Model (SM). Based on a simple model in which couplings of the SM fermions in the third generation with the Z -boson are different from those of the corresponding fermio...

The possibility of detecting a Higgs boson through several production and decay channels is instrumental to the measurement of its couplings. In this paper we study the pp → tt̄H, H → τ+τ− channel at the LHC, for the case of a scalar Higgs boson, and use the obtained results to improve on existing strategies toward a model independent determination of the Higgs boson couplings. The case of a sca...

Mass of the W boson (MW ) is a fundamental parameter in the electroweak sector of the standard model (SM). The parameters, Fermi constant (GF ), the fine structure constant (α), mass of the Z boson (MZ), and electroweak radiative correction δr are expressed in terms of MW . Among these parameters GF , αEM , and MZ are measured to very high precision. Thus the measurement of MW can be used to co...

The Higgs-boson production in association with a W-boson pair at e+e− linear colliders is one of the important processes in probing the coupling between Higgsboson and vector gauge bosons and discovering the signature of new physics. We describe the impact of the complete electroweak(EW) radiative corrections of O(αew) to this process in the standard model(SM) at the International Linear Collid...

After years of efforts to push the LEP performance to, and indeed beyond, the limits of what had been believed possible, hints of a signal of a Higgs boson at 115GeV/c appeared in June 2000, were confirmed in September, and confirmed again in November. Spending an additional six-month period with LEP would have given the unambiguous opportunity of a fundamental discovery. Instead, this possibil...

We demonstrate that a measurement of the Bjorken process e + e − , µ + µ − → ZH in the threshold region can yield a precise determination of the Higgs boson mass. With an integrated luminosity of 100 fb −1 , it is possible to measure the Higgs mass to within 60 MeV (100 MeV) for m H = 100 GeV (150 GeV). One of the triumphs of the LEP program was the measurement of the Z-boson mass to two MeV. E...

Higgs boson mass sum rules of supersymmetric models offer attractive targets for precision tests at future muon colliders. These sum rules involve the gauge boson masses as well as the masses of the Higgs boson states which can be precisely measured in the s-channel production process at a muon collider. These measurements can sensitively probe radiative corrections to the Higgs boson masses as...