119563879
Loop-induced radiative decays of neutral scalars and neutral vector bosons in left-right symmetric theories
Abstract We compute the decay widths of the radiative modes h 0 (H 0 , δ L 0r ) → γγ , γ Z and Z′→ γ h 0 (H 0 , δ L 0r ), where h 0 , H 0 and δ L 0r are the light neutral Higgs scalars of left-right symmetric (LR) models with a minimal Higgs potential. We use a nonlinear R -gauge to compute these one-loop induced decays. We find that only the decay modes which involve the scalar h 0 , the LR analogue of the standard model Higgs boson, are not suppressed by LR mixing angles.
118371403
Phenomenological aspects of the exotic T quark in 331 models
In the context of 331 models we analyze the phenomenology of exotic T quarks with electric charge 2/3. We establish bounds for the corresponding masses and mixing angles and study the decay modes T→bW, tZ and qH. It is found that the decays into scalars are strongly dependent on the model parameters and can be the dominant ones in a scenario with approximate flavor symmetry.
118990339
Upper bound of the lightest higgs boson in a supersymmetric SU(3)l x U(1)x gauge model
A supersymmetric version of the $SU(3)_L \otimes U(1)_X$ gauge model is presented. The model is embedded in a $SU(6)_L \otimes U(1)_X$ gauge group and it has been built up completely quiral anomaly free and without any exotic charges in the fermionic content. The Minimal Supersymmetric Standard Model can be seen as an effective theory of this larger symmetry. We analyze how the spectrum of the new model can shift the upper bound on the CP-even Higgs boson and we find that it can be moved up to 143 GeV.
118933615
The lightest Higgs boson production at photon colliders in the 2HDM-III
The branching ratios of the lightest CP-even Higgs boson $h^0$, in the framework of the General Two Higgs Doublet Model are calculated. Different scenarios are presented taking into account constraints obtained in previous works on the flavor changing neutral currents factors. Plausible scenarios with flavour changing processes at tree level like $b \bar s$ and $t \bar c$ are analyzed for relevant region of parameters. The loop-induced Higgs couplings to photon pairs can be tested with a photon collider. The number of events of $h^0$ as a resonance in photon colliders are calculated taking into account its corresponding background signal in TESLA, CLIC and NLC.
116996866
Lepton substructure effects from Z decays
Composite models predict the existence of excited quarks and leptons. We find bounds for the masses of possible excited lepton states and for the substructure scale by using radiative corrections at the Z scale. A non‐decoupling scenario arises naturally which induces upper bounds on these masses as a function of the substructure scale.