Blar i HVL Open på forfatter "Øgreid, Odd Magne"

A simple method to detect spontaneous CP violation in multiHiggs models
Øgreid, Odd Magne; Osland, Per; Rebelo, Margarida N. (Peer reviewed; Journal article, 2017) 
Complex S <inf>3</inf>symmetric 3HDM
Kunčinas, A.; Øgreid, Odd Magne; Osland, Per; Rebelo, M.N. (Peer reviewed; Journal article, 2023)CP violation plays a very important role in nature with implications both for Particle Physics and for Cosmology. Accounting for the observed matterantimatter asymmetry of the Universe requires the existence of new sources ... 
CP violation in extended Higgs sectors
Øgreid, Odd Magne; Osland, Per; Rebelo, Margarida N. (Journal article; Peer reviewed, 2018)We discuss how one can identify CP violation (and conservation) in multiHiggsdoublet potentials. After a brief review of CP violation in the 2HDM, we refer to the fact that for NHDM with N ≥ 3 the well known methods ... 
CP Violation in the scalar sector
EmmanuelCosta, David; Øgreid, Odd Magne; Osland, Per; Rebelo, Margarida N. (Peer reviewed; Journal article, 2016) 
The CPsymmetries of the 2HDM
Grzadkowski, Bohdan; Øgreid, Odd Magne; Osland, Per (Peer reviewed; Journal article, 2020)We discuss the three different classes of CPsymmetries that can be realized in a twoHiggsdoublet model, CP1, CP2 and CP3. We express conditions for realizing these symmetries in terms of masses and couplings of the ... 
CPviolation in the ZZZ and ZWW vertices at e + e − colliders in TwoHiggsDoublet models
Grzadkowski, Bohdan; Øgreid, Odd Magne; Osland, Per (Peer reviewed; Journal article, 2016)We discuss possibilities of measuring CP violation in the TwoHiggsDoublet Model by studying effects of oneloop generated ZZZ and ZW W vertices. We discuss a set of CPsensitive asymmetries for ZZ and W+W− production at ... 
Dark matter in a CPviolating threeHiggsdoublet model with S3 symmetry
Kuncinas, Anton; Øgreid, Odd Magne; Osland, Per; Rebelo, Margarida N. (Peer reviewed; Journal article, 2022)In spite of the success of the Standard Model of particle physics, there are some theoretical predictions which are not yet fully established experimentally, as well as some experimental observations which cannot be fitted ... 
Dark matter in threeHiggsdoublet models with S <inf>3</inf> symmetry
Khater, W.; Kunčinas, A.; Øgreid, Odd Magne; Osland, Per; Rebelo, M.N. (Peer reviewed; Journal article, 2022)Models with two or more scalar doublets with discrete or global symmetries can have vacua with vanishing vacuum expectation values in the bases where symmetries are imposed. If a suitable symmetry stabilises such vacua, ... 
Diagnosing CP properties of the 2HDM
Grzadkowski, Bohdan; Øgreid, Odd Magne; Osland, Per (Peer reviewed; Journal article, 2014) 
Heavy Higgs boson decays in the alignment limit of the 2HDM
Grzadkowski, Bohdan; Haber, Howard E.; Øgreid, Odd Magne; Osland, Per (Journal article; Peer reviewed, 2018)The Standard Model (SM)like couplings of the observed Higgs boson impose strong constraints on the structure of any extended Higgs sector. We consider the theoretical properties and the phenomenological implications of a ... 
Implications of symmetries in the scalar sector
Haber, Howard E.; Øgreid, Odd Magne; Osland, Per; Rebelo, Margarida N. (Peer reviewed; Journal article, 2020)Symmetries play a very important rôle in Particle Physics. In extended scalar sectors, the existence of symmetries may permit the models to comply with the experimental constraints in a natural way, and at the same time ... 
Invariants and CP violation in the 2HDM
Øgreid, Odd Magne (Journal article; Peer reviewed, 2018)We discuss the importance of basis invariants in the general 2HDM and how these relates to masses and couplings. We also present a simple, yet powerful technique to translate parameters of the potential into combinations ... 
Measuring CP violation in twoHiggsdoublet models in light of the LHC Higgs data
Grzadkowski, Bohdan; Øgreid, Odd Magne; Osland, Per (Peer reviewed; Journal article, 2014) 
S3inspired threeHiggsdoublet models: A class with a complex vacuum
Kuncinas, Anton; Osland, Per; Øgreid, Odd Magne; Rebelo, Margarida N. (Peer reviewed; Journal article, 2020)In this paper we analyze in detail an S3symmetric threeHiggsdoublet model with a specific vacuum configuration. This analysis allows us to illustrate important features of models with several Higgs doublets, such as the ... 
Softly broken symmetries in the 2HDM — an invariant formulation
Ferreira, P.M.; Grzadkowski, B.; Øgreid, Odd Magne; Osland, Per (Peer reviewed; Journal article, 2023)Soft breaking of a symmetry requires an invariance of the dimension4 part of the Lagrangian and nontrivial variation of the lowerdimensional part. However, in general, separation between the dim4 and lowerdimensional ... 
Some properties of the generic 2HDM in the alignment limit
Grzadkowski, Bohdan; Øgreid, Odd Magne; Osland, Per (Journal article; Peer reviewed, 2017)We discuss various properties of the generic twoHiggsdoublet extension of the Standard Model focusing on the region of parameter space known as the alignment limit. We emphasize that in the alignment limit in order to ... 
Spontaneous symmetry breaking in the S 3symmetric scalar sector
EmmanuelCosta, David; Øgreid, Odd Magne; Osland, Per; Rebelo, Margarida N. (Peer reviewed; Journal article, 2016) 
Spontaneous symmetry breaking in threeHiggsdoublet S3symmetric models
EmmanuelCosta, David; Øgreid, Odd Magne; Osland, Per; Rebelo, Margarida N. (Peer reviewed; Journal article, 2017) 
Symmetries and mass degeneracies in the scalar sector
Haber, Howard E.; Øgreid, Odd Magne; Osland, Per; Rebelo, Margarida N. (Journal article; Peer reviewed, 2019)We explore some aspects of models with two and three SU(2) scalar doublets that lead to mass degeneracies among some of the physical scalars. In Higgs sectors with two scalar doublets, the exact degeneracy of scalar masses, ... 
Symmetries and mass degeneracies in the scalar sector
Haber, Howard E.; Øgreid, Odd Magne; Osland, Per; Rebelo, Margarida N. (Peer reviewed; Journal article, 2019)We explore some aspects of models with two and three SU(2) scalar doublets that lead to mass degeneracies among some of the physical scalars. In Higgs sectors with two scalar doublets, the exact degeneracy of scalar masses, ...