We discuss the strength of the trilinear Higgs boson coupling in technicolor (or composite) models in a model independent way. The coupling is determined as a function of a very general ansatz for the technicolor self-energy, and turns out to be equal or smaller than the one of the standard model Higgs boson depending on the dynamics of the theory. With this trilinear coupling we estimate the c...

We present a detailed discussion of the particle spectrum of the Non-Minimal Supersymmetric Standard Model (NMSSM), containing two Higgs doublets and a singlet, in the limit tan β ≃ mt/mb. This is compared with the corresponding particle spectrum of the Minimal Supersymmetric Standard Model (MSSM). In this limit the singlet vacuum expectation value is forced to be large, of the order of 10 TeV,...

The Next–to–Minimal Supersymmetric Standard Model (NMSSM) includes a Higgs iso-singlet superfield in addition to the two Higgs doublet superfields of the minimal supersymmetric extension. The Higgs sector and neutralino sectors of this model are examined within the context of a future e + e − linear collider.

We demonstrate that an LHC Higgs search in weak boson fusion production with subsequent decay to weak boson pairs is robust against extensions of the Standard Model or MSSM involving a large number of Higgs doublets. We also show that the transverse mass distribution provides unambiguous discrimination of a continuum Higgs signal from the Standard Model.

The Higgs mechanism is the heart of the Standard Model (SM) providing masses to gauge bosons via electroweak symmetry breaking (EWSB). However, the SM fails to explain the origin of the Higgs mechanism and has certain naturalness problems, such as the extreme fine tuning required to keep the higher order corrections to the higgs mass under control (the so called hierarchy problem). In popular S...

We investigate a model of SU (2) ⊗ U (1) singlet scalars coupled to Standard Model. We point out that for the case of the maximal mixing between singlet scalars and standard Higgs boson the Higgs boson production cross section is smaller than the standard Higgs boson production by factor 1 N +1 , where N is the number of singlet scalars. For the case of big mixing Higgs boson could be nonobserv...

We conduct a general discussion of supersymmetric models with three families in the Higgs sector. We analyse the scalar potential, and investigate the minima conditions, deriving the mass matrices for the scalar, pseudoscalar and charged states. Depending on the Yukawa couplings and the Higgs spectrum, the model might allow the occurrence of potentially dangerous flavour changing neutral curren...

he standard model unifies the electromagnetic and weak interactions into a single framework that requires that the electroweak symmetry of the unified theory is broken at low energies. In the standard model, this is accomplished through the Higgs mechanism. Beyond generating the requisite symmetry breaking, this mechanism also produces a heavy spin 0 particle, the Higgs bo-son. Observation of t...

Higgs boson production in association with bottom quarks, is one of the most important discovery channels for Higgs particles in the Standard Model (SM) and its supersymmetric extension at the LHC pp collider . The theoretical prediction of the corresponding cross section has been improved by including the complete next-to-leading order QCD corrections. We review the status results for the lead...

In large extra dimension models the presence of an interaction between the Ricci scalar curvature and the Higgs doublet of the Standard Model can give rise to an invisible decay of the Higgs to Kaluza Klein graviscalars. The corresponding invisible width can cause a suppression of the LHC rates of a light Higgs in the visible channels below 5σ in some regions of the parameter space of the model...