نتایج جستجو برای: اثر 2hdm
تعداد نتایج: 148844 فیلتر نتایج به سال:
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...
Higgs boson decays mediated by flavor changing neutral currents (FCNC) are very much suppressed in the Standard Model, at the level of 10 for Higgs boson masses of a few hundred GeV . Therefore, any experimental vestige of them would immediately call for new physics. In this paper we consider the FCNC decays of Higgs bosons into top quarks in a general two-Higgs-doublet model (2HDM). The isolat...
The recently reported measurement of the W-boson mass by CDF-II collaboration is significantly heavier than that Standard Model prediction. We study this anomaly in scale invariant Two-Higgs-Doublet-Model (SI-2HDM) with a Z2 symmetry to avoid flavor-changing-neutral-current (FCNC). In scenario Higgs particle classically massless scalon SI-2HDM gaining its radiative corrections, hence being natu...
The asymmetries Ak ≡ [Γ(t → Wdk)−Γ(t̄ → Wd̄k)]/[Γ(t → Wdk)+Γ(t̄ → Wd̄k)] in the partial widths of the top quark decays are discussed within the Standard Model (SM), the Two-Higgs-Doublet Model (2HDM) and supersymmetric extensions of the SM (SSM). The leading contributions to these asymmetries in the SM and in the 2HDM are induced by the up-type quark self-energy diagrams and are found to be very sm...
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