The next–to–leading order predictions for the branching ratio BR(B → X s γ) are given in a generalized class of two Higgs doublets models. Included are the recently calculated leading QED corrections. It is shown that the high accuracy of the Standard Model calculation is in general not shared by these models. Updated lower limits on the mass of the charged Higgs boson in Two Higgs Doublet Mode...

We perform an exhaustive analysis of the most general Higgs sector of the minimal left-right symmetric model ~MLRM!. We find that the CP properties of the vacuum state are connected to the Higgs spectrum: if CP is broken spontaneously, the MLRM does not approach the standard model in the limit of a decoupling left-right symmetry breaking scale. Depending on the size of the CP phases, scenarios ...

Electroweak baryogenesis (EWBG) in the MSSM can account for the cosmological baryon asymmetry, but only within a restricted region of the parameter space. In particular, MSSM EWBG requires a mostly right-handed stop that is lighter than the top quark and a standard model-like light Higgs boson. In the present work we investigate the effects of the light stop on Higgs boson production and decay....

Recently, it has been pointed out that dimensionless actions in four dimensional curved spacetime possess a symmetry which goes beyond scale invariance but is smaller than full Weyl invariance. This symmetry was dubbed restricted Weyl invariance. We show that starting with a restricted Weyl invariant action that includes a Higgs sector with no explicit mass, one can generate the Einstein-Hilber...

We study the heavy Higgs sector of the MSSM composed of the H±, H and A particles in the so-called decoupling limit where mA0 mZ . By integrating out these heavy Higgs particles to one-loop, we compute the effective action for the electroweak gauge bosons and find out that, in the decoupling limit, all the heavy Higgs effects can be absorbed into redefinitions of the Standard Model electroweak ...

" The search for the Higgs boson is the task # 1 of high energy physics " L. Abstract The status of the Higgs boson mass in the Standard Model and its supersym-metric extensions is reviewed and the perspectives of Higgs searches are discussed. The parameter space of the Minimal Supersymmetric Standard Model (MSSM) is analysed with the emphasis on the lightest Higgs mass. The infrared behaviour ...

Searches for the Standard Model Higgs boson by the four LEP experiments found excess events in two mass ranges: a 2.3σ excess around 98 GeV, and an 1.7σ excess around 115 GeV. The latter has been discussed widely in the literature, but the former has attracted little attention so far. In this paper I explore the possibility of explaining the excess near 98 GeV through production of the lighter ...

Gauge-coupling unification is just as successful in the standard model with six Higgs doublets as it is in the minimal supersymmetric standard model. However, the gauge couplings unify at 10 GeV, which yields rapid proton decay in the SU(5) model. I propose that the grand-unified gauge group is instead SU(3)c × SU(3)L × SU(3)R, in which baryon number is conserved by the gauge interactions. Natu...

One of the main goals of the Large Hadron Collider (LHC) under construction at CERN is the search for, discovery and measurement of the Higgs boson, the particle associated with the field that can provide a mechanism for electroweak symmetry breaking in the Standard Model. The mass of the Higgs boson is unknown but precise measurements of electroweak processes hint towards a value below 196 GeV...