Results 51 to 60 of about 66,560 (217)
, 1992 We investigate the possibility of a multi-Higgs doublet model where the lightest neutral Higgs boson ($h^0$) decouples from the fermion sector. We are partially motivated by the four $\ell^+\ell^-\gamma\gamma$ events with $M_{\gamma\gamma}\simeq60$\,GeV ...
Barger, V. +3 more
core +3 more sources
The Higgs Decay Width in Multi-Scalar Doublet Models [PDF]
, 2007 We show that there are regions of parameter space in multi-scalar doublet models where, in the first few hundred inverse femtobarns of data, the new charged and neutral scalars are not directly observable at the LHC and yet the Higgs decay rate to b bbar
Mantry, Sonny +2 more
core +2 more sources
CP-violation, asymmetries and interferences in t t ¯ ϕ $$ t\overline{t}\phi $$
Journal of High Energy Physics, 2022 In this paper, we use the associated production of top-quark pairs ( t t ¯ $$ t\overline{t} $$ ) with a generic scalar boson (ϕ) at the LHC (pp → t t ¯ ϕ $$ t\overline{t}\phi $$ ) to explore the sensitivity of a large set of observables to the sign of ...
Duarte Azevedo +3 more
doaj +1 more source
New tools for dissecting the general 2HDM
Journal of High Energy Physics, 2023 Two Higgs doublet models (2HDM) provide the low energy effective theory (EFT) description in many well motivated extensions of the Standard Model. It is therefore relevant to study their properties, as well as the theoretical constraints on these models.
Henning Bahl +4 more
doaj +1 more source
, 1999 Abstract The scalar sector of the standard model (SM) consists of only one doublet with weak hypercharge Y = 1/2. Most extensions of the SM include an enlargement of the Higgs sector. There are many theoretical motivations to enlarge the scalar sector of the standard electroweak theory, even if one only considers extensions of that ...
Gustavo Castelo Branco +2 more
openaire +1 more source
Scalar resonances in leptophilic multi-Higgs-boson models [PDF]
Physical Review D, 1999 We show that the Higgs resonance can be amplified in a 3-3-1 model with a multi-Higgs-boson ''lepto- philic'' scalar sector. This would allow the observation of the Higgs particle in muon colliders even for Higgs boson masses considerably higher than the ones expected to be seen in the electroweak standard model framework.
Montero, J. C., De, C. A., Pleitez, V.
openaire +3 more sources
TeV-scale seesaw from a multi-Higgs model [PDF]
The European Physical Journal C, 2010 We suggest new simple model of generating tiny neutrino masses through a TeV-scale seesaw mechanism without requiring tiny Yukawa couplings. This model is a simple extension of the standard model by introducing extra one Higgs singlet, and one Higgs doublet with a tiny vacuum expectation value.
Haba, Naoyuki, Hirotsu, Masaki
openaire +2 more sources
Spontaneous CP Violating Phase as The CKM Matrix Phase
, 2007 We propose that the CP violating phase in the CKM mixing matrix is identical to the CP phases responsible for the spontaneous CP violation in the Higgs potential. A specific multi-Higgs model with Peccei-Quinn (PQ) symmetry is constructed to realize this
A.R. Zhitnitsky +47 more
core +1 more source
Tree-Level Vacuum Stability in Multi Higgs Models [PDF]
Proceedings of International Europhysics Conference on High Energy Physics — PoS(HEP2005), 2007 In the most general model with two Higgs doublets, if a minimum that preserves the $U(1)_{em}$ symmetry exists, then charge breaking (CB) minima cannot occur. The depth of the potential at a stationary point that breaks CB or CP, relative to the $U(1)_{em}$ preserving minimum, is proportional to the squared mass of the charged or pseudoscalar Higgs ...
Barroso, A., Ferreira, P. M., Santos, R.
openaire +2 more sources
Journal of High Energy Physics, 2023 CP violation plays a very important role in nature with implications both for Particle Physics and for Cosmology. Accounting for the observed matter-antimatter asymmetry of the Universe requires the existence of new sources of CP violation beyond the ...
A. Kunčinas +3 more
doaj +1 more source