نتایج جستجو برای: 2hdm effect
تعداد نتایج: 1641991 فیلتر نتایج به سال:
We study the dilution of dark matter (DM) relic density caused by electroweak first-order phase transition (FOPT) in singlet extension models, including standard model (xSM), two-Higgs-doublet (2HDM+S) and next-to-minimal supersymmetric (NMSSM). find that these models entropy released strong FOPT can dilute DM to 1/3 at most. Nevertheless, xSM NMSSM where field configure is relevant temperature...
We argue that the consistent implementation of the multiple point principle (MPP) in the general non-supersymmetric two Higgs doublet model (2HDM) can lead to a set of approximate global custodial symmetries that ensure CP conservation in the Higgs sector and the absence of flavour changing neutral currents (FCNC) in the considered model. In particular the existence of a large set of degenerate...
We obtain tree-level unitarity constraints for the Two Higgs Doublet Model (2HDM) with explicit CP -violation. We limit ourselves to the case with soft violation of the discrete Z2 symmetry of theory. The key role is played by the rephasing invariance of the 2HDM lagrangian. Our simple approach for derivation of these constraints can be easily transferred to other forms of Higgs sector. We brie...
In these notes, the theoretical details of the two-Higgs doublet model (2HDM) are described with an eye toward developing benchmark scenarios for LHC Higgs studies. In particular, the Type-I and Type-II 2HDM parameters are formulated subject to the condition that the lightest CP-even Higgs boson is identified with the 126 GeV boson discovered on 4 July 2012. Some preference is given to the regi...
We discuss tests of the charged Higgs sector of the Two Higgs Doublet Model (2HDM) of Type II in the light of recent flavour physics data. Particular attention is paid to recent measurement of purely leptonic decays of heavy-light mesons, which depart more or less significantly from the Standard Model (SM) predictions. We derive constraints on the parameters of the 2HDM type II from leptonic an...
Including contributions of scale-dependent vacuum expectation values, we derive new analytic formulas and obtain substantially different numerical predictions for the running masses of quarks and charged-leptons at higher scales in the SM, 2HDM and MSSM. These formulas exhibit significantly different behaviours with respect to their dependence on gauge and Yukawa couplings than those derived ea...
Abstract We discuss the structure of a model with an extended gauge symmetry group $$SU(2)\times SU(2)\times U(1)$$ S U ( 2 ) × 1 correspondingly rich Electroweak Symmetry Breaking stru...
A search is made for charged Higgs bosons predicted by Two-Higgs-Doublet extensions of the Standard Model (2HDM) using electron-positron collision data collected by the OPAL experiment at √ s = 189–209 GeV, corresponding to an integrated luminosity of approximately 600 pb −1. Charged Higgs bosons are assumed to be pair-produced and to decay into q¯ q, τ ν τ or AW ± *. No signal is observed. Mod...
The Higgs sector of the Standard Model and of the Two Higgs Doublet Extensions of SM, MSSM and the general 2HDM, can be tested in processes involving photons. A short review of the corresponding results is presented.
We present the implications of recent measurement $W$ boson at CDF II on two-Higgs-doublet model (2HDM). In analysis, we impose theoretical bounds such as vacuum stability and perturbative unitarity, several experimental constraints. addition, take into account ${\mathrm{sin}}^{2}{\ensuremath{\theta}}_{W}({m}_{Z}{)}_{\overline{\mathrm{MS}}}$ top $W$-boson mass to investigate how $S$ $T$ paramet...
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