1Institute of Theoretical Physics, University of Warsaw 00-681 Warsaw, ul. Hoża 69, Poland 2TH-Division, CERN, CH-1211 Genéve 23, Switzerland Mass range of the charged Higgs boson in the 2HDM with explicit and spontaneous CP violation is discussed.Constraints on MH± in the CP conserving 2HDM(II) are shown. 1 The 2HDM potential and spontaneous symmetries breaking The most general, invariant unde...

Abstract In the Two-Higgs-Doublet Model(2HDM) with large extra dimensions(LED), we study the contributions of virtual Kaluza-Klein(KK) gravitons to 2HDM charged Higgs production, especially in the two important production processes e+e− → H+H− and e+e− → Htb̄, at future linear colliders (LC). We find that KK graviton effects can significantly modify these total cross sections and also their diff...

The Higgs potential of 2HDM keeps its generic form under the group of transformation GL(2, C), which is larger than the usually considered reparametrization group SU(2). This reparametrization symmetry induces the Minkowski space structure in the orbit space of 2HDM. Exploiting this property, we present a geometric analysis of the number and properties of stationary points of the most general 2...

Properties of the Higgs sector of Two Higgs Doublet Model (2HDM) and existing constraints on its parameters are discussed. Potential of the Photon Linear Collider in testing various Higgs scenarios of 2HDM, including the MSSM, based on the realistic simulations is also presented. 1 Symmetries of the 2HDM [1] The Higgs sector with two scalar complex doublets (Y = ±1) is the simplest yet very ric...

We argue that multiple point principle (MPP) can be used to ensure CP conservation and the absence of flavour changing neutral currents within the two Higgs doublet model (2HDM). We also discuss Higgs phenomenology in the MPP inspired 2HDM. PACS. 12.60.Fr Extensions of electroweak Higgs sector – 14.80.Bn Standard-model Higgs bosons

The Higgs potential of 2HDM keeps its generic form under the group of transformation GL(2, C), which is larger than the usually considered reparametrization group SU(2). This reparametrization symmetry induces the Minkowski space structure in the orbit space of 2HDM. Exploiting this property, we present a geometric analysis of the number and properties of stationary points of the most general 2...

We investigate the reduction of a general TeV-scale supersymmetric extra U(1) model to a 2HDM below the TeVscale through the tree level nondecoupling. Portions of the parameter space of the extra U(1) model appropriate for obtaining a 2HDM are identified. Various properties of the resulting 2HDM are connected to the parameter space of the underlying model. PACS: 12.60.Jv, 12.60.Cn, 12.60.Fr Add...

We discuss the flavor-changing neutral currents (FCNC) decays of the top quark t → cV i V j (V i = γ, Z, g) in the framework of the Standard Model (SM) and in a two-Higgs doublet model (2HDM) with tree-level FCNC couplings. While in the SM the expected branching ratios are extremely small, in the 2HDM they may be sizable, of order 10 −4 − 10 −5 , and thus accessible at the CERN Large Hadron Col...

We present a calculation of the BB0–mixing including Next–to–Leading Order (NLO) QCD corrections within the Two Higgs Doublet Model (2HDM). The QCD corrections at NLO are contained in the factor denoted by η2 which modifies the result obtained at the lowest order of perturbation theory. In the Standard Model case, we confirm the results for η2 obtained by Buras, Jamin and Weisz [1]. The factor ...