Browsing Department of Physics and Technology by Author "Øgreid, Odd Magne"
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CP violation in extended Higgs sectors
Øgreid, Odd Magne; Osland, Per; Rebelo, Margarida N. (Peer reviewed; Journal article, 20180824)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. (Conference object; Peer reviewed; Journal article, 2016)Models with an extended scalar sector may in principle provide new sources of CP violation originating in the scalar potential. One of the simplest ways to implement this idea is to have CP violation in a twoHiggsdoublet ... 
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, 201605)We discuss possibilities of measuring CP violation in the TwoHiggsDoublet Model by studying effects of oneloop generated \(ZZZ\) and \(ZWW\) vertices. We discuss a set of CPsensitive asymmetries for \(ZZ\) and \(W^+W^\) ... 
Diagnosing CP properties of the 2HDM
Grzadkowski, Bohdan; Øgreid, Odd Magne; Osland, Per (Peer reviewed; Journal article, 201401)We have investigated a TwoHiggsDoublet Model (2HDM), focusing on CP violation. Various scenarios with spontaneous and explicit breaking of CP have been considered. Some features of CP violation related to a choice of the ... 
Heavy Higgs boson decays in the alignment limit of the 2HDM
Øgreid, Odd Magne; Osland, Per; Grzadkowski, Bohdan; Haber, Howard (Peer reviewed; Journal article, 201812)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 ... 
Measuring CP violation in twoHiggsdoublet models in light of the LHC Higgs data
Grzadkowski, Bohdan; Øgreid, Odd Magne; Osland, Per (Peer reviewed; Journal article, 201411)In TwoHiggsDoublet models, the conditions for CP violation can be ex pressed in terms of invariants under U(2) rotations among the two SU(2) Higgs doublet fields. In order to design a strategy for measuring the invariants ... 
A simple method to detect spontaneous CP violation in multiHiggs models
Øgreid, Odd Magne; Osland, Per; Rebelo, Margarida N. (Peer reviewed; Journal article, 201708)For models with several Higgs doublets we present an alternative method to the one proposed by Branco, Gerard and Grimus, in 1984, to check whether or not CP is spontaneously violated in the Higgs potential. The previous ... 
Some properties of the generic 2HDM in the alignment limit
Grzadkowski, Bohdan; Øgreid, Odd Magne; Osland, Per (Peer reviewed; Journal article, 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 S3symmetric scalar sector
EmmanuelCosta, David; Øgreid, Odd Magne; Osland, Per; Rebelo, Margarida N. (Peer reviewed; Journal article, 201602)We present a detailed study of the vacua of the S3symmetric threeHiggsdoublet potential, specifying the region of parameters where these minimisation solutions occur. We work with a CP conserving scalar potential and ... 
Spontaneous symmetry breaking in threeHiggsdoublet \(S_3\)symmetric models
EmmanuelCosta, David; Øgreid, Odd Magne; Osland, Per; Rebelo, Margarida N. (Peer reviewed; Journal article, 2017)The talk summarises work done by the authors consisting of a detailed study of the possible vacua in models with three Higgs doublets with \(S_3\) symmetry and without explicit CP violation. Different vacua require special ... 
Symmetries and mass degeneracies in the scalar sector
Haber, Howard E.; Øgreid, Odd Magne; Osland, Per; Rebelo, Margarida N. (Peer reviewed; Journal article, 20190104)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, ... 
Testing the presence of CP violation in the 2HDM
Grzadkowski, Bohdan; Øgreid, Odd Magne; Osland, Per (Conference object; Peer reviewed; Journal article, 20150427)We review CP properties of the TwoHiggsDoublet model. In particular, we show that sponta neous CP violation occurs in the parameter space on the border between regions allowing explicit CP violation and those where there ... 
Update on the CPViolating InertDoublet Model
Grzadkowski, Bohdan; Øgreid, Odd Magne; Osland, Per; Pukhov, Alexander; Purmohammadi, Mahdi (Conference object; Peer reviewed; Journal article, 2012)We have updated a recently proposed extension of the Inert Doublet Model. The extension amounts to the addition of an extra noninert scalar doublet. The model thus offers a possibility of CP violation in the scalar sector ...