Blar i Bergen Open Research Archive på forfatter "Osland, Per"
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Long lived charginos in Natural SUSY?
Bomark, Nils-Erik; Kvellestad, Anders; Lola, Smaragda; Osland, Per; Raklev, Are (Peer reviewed; Journal article, 2014-05-05)Supersymmetric models with a small chargino-neutralino mass difference, and as a result metastable charginos, have been a popular topic of investigation in collider phenomenology. The possibility of a chargino lighter than ... -
Measuring CP violation in two-Higgs-doublet models in light of the LHC Higgs data
Grzadkowski, Bohdan; Øgreid, Odd Magne; Osland, Per (Peer reviewed; Journal article, 2014-11)In Two-Higgs-Doublet 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 ... -
Photon, neutrino and charged particle spectra from R-violating gravitino decays
Bomark, Nils-Erik; Lola, Smaragda; Osland, Per; Raklev, Are Reinert (Peer reviewed; Journal article, 2010-03-22)We study photonic, neutrino and charged particle signatures from slow decays of gravitino dark matter in supersymmetric theories where R-parity is explicitly broken by trilinear operators. Photons and (anti-)fermions from ... -
Probing the charged Higgs boson at the LHC in the CP-violating type-II 2HDM
Basso, L.; Lipniacka, Anna; Moretti, S.; Osland, Per; Pruna, G. M.; Poormohammadi, Mahdi (Peer reviewed; Journal article, 2012-11-05)We present a phenomenological study of a CP-violating two-Higgs-doublet Model with type-II Yukawa couplings at the Large Hadron Collider (LHC). In the light of recent LHC data, we focus on the parameter space that survives ... -
R-parity violating chargino decays at the LHC
Bomark, Nils-Erik; Kvellestad, Anders; Lola, Smaragda; Osland, Per; Raklev, Are (Peer reviewed; Journal article, 2014-12)Supersymmetric models with R-parity violation (RPV) have become more popular following the lack of any excess of missing energy events at the 8 TeV LHC. To identify such models, the suggested searches generally rely on the ... -
Reinterpretation of LHC results for new physics: status and recommendations after run 2
Athron, Peter; Balázs, Csaba; Buckley, Andy; Gonzalo, Tomas Esteban; Kvellestad, Anders; Osland, Per; Raklev, Are; Scott, Pat (Journal article; Peer reviewed, 2020-08-21)We report on the status of efforts to improve the reinterpretation of searches and measurements at the LHC in terms of models for new physics, in the context of the LHC Reinterpretation Forum. We detail current experimental ... -
S3-inspired three-Higgs-doublet models: A class with a complex vacuum
Kuncinas, Anton; Osland, Per; Øgreid, Odd Magne; Rebelo, Margarida N. (Journal article; Peer reviewed, 2020)In this paper we analyze in detail an S3-symmetric three-Higgs-doublet model with a specific vacuum configuration. This analysis allows us to illustrate important features of models with several Higgs doublets, such as the ... -
A simple method to detect spontaneous CP violation in multi-Higgs models
Øgreid, Odd Magne; Osland, Per; Rebelo, Margarida N. (Peer reviewed; Journal article, 2017-08)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 ... -
Softly broken symmetries in the 2HDM — an invariant formulation
Ferreira, P.M.; Grzadkowski, B.; Øgreid, Odd Magne; Osland, Per (Journal article; Peer reviewed, 2023)Soft breaking of a symmetry requires an invariance of the dimension-4 part of the Lagrangian and non-trivial variation of the lower-dimensional part. However, in general, separation between the dim-4 and lower-dimensional ... -
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 two-Higgs-doublet 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 S3-symmetric scalar sector
Emmanuel-Costa, David; Øgreid, Odd Magne; Osland, Per; Rebelo, Margarida N. (Peer reviewed; Journal article, 2016-02)We present a detailed study of the vacua of the S3-symmetric three-Higgs-doublet potential, specifying the region of parameters where these minimisation solutions occur. We work with a CP conserving scalar potential and ... -
Spontaneous symmetry breaking in three-Higgs-doublet \(S_3\)-symmetric models
Emmanuel-Costa, 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, 2019-01-04)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 of the 2HDM: an invariant formulation and consequences
Ferreira, Pedro M.; Grzadkowski, Bohdan; Øgreid, Odd Magne; Osland, Per (Journal article; Peer reviewed, 2021)Symmetries of the Two-Higgs-Doublet Model (2HDM) potential that can be extended to the whole Lagrangian, i.e. the CP-symmetries CP1, CP2, CP3 and the Higgs-family symmetries Z2, U(1) and SO(3) are discussed. Sufficient and ... -
Symmetry and mass degeneration in multi-Higgs-doublet models
Olaussen, Kåre; Osland, Per; Solberg, Marius Aase (Peer reviewed; Journal article, 2011-07-05)We investigate possible symmetry properties of the scalar sector of Multi-Higgs-Doublet Models, and, to some extent, the generalization of such models to gauge groups other than SU(2)_L × U(1)_Y . In models with C (charge ... -
Testing the presence of CP violation in the 2HDM
Grzadkowski, Bohdan; Øgreid, Odd Magne; Osland, Per (Peer reviewed; Journal article, 2015-04-27)We review CP properties of the Two-Higgs-Doublet 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 ... -
Two dark matter candidates in three-Higgs-doublet models with S3 symmetry
Kuncinas, Anton; Øgreid, Odd Magne; Osland, Per; Rebelo, Margarida Nesbitt (Journal article; Peer reviewed, 2022)Models with an extended scalar electroweak sector can have vanishing vacuum expectation values in a basis where an underlying symmetry is imposed. Such extensions are very well motivated. If a symmetry prevents couplings ... -
Update on the CP-Violating Inert-Doublet Model
Grzadkowski, Bohdan; Øgreid, Odd Magne; Osland, Per; Pukhov, Alexander; Purmohammadi, Mahdi (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 non-inert scalar doublet. The model thus offers a possibility of CP violation in the scalar sector ... -
Updated constraints on Z′ and W′ bosons decaying into bosonic and leptonic final states using the run 2 ATLAS data
Osland, Per; Pankov, A.A.; Serenkova, I.A. (Journal article; Peer reviewed, 2021)The full ATLAS run 2 dataset with a time-integrated luminosity of 139 fb−1 in the diboson and dilepton channels is used to probe benchmark models with extended gauge sectors: the E6-motivated grand unification models, the ... -
Weinberg’s 3HDM potential with spontaneous CP violation
Plantey, Robin Maurice Yves; Øgreid, Odd Magne; Osland, Per; Rebelo, Margarida N.; Solberg, Rolf Marius Aase (Journal article; Peer reviewed, 2023)We study the potential of Weinberg’s Z2×Z2-symmetric three-Higgs-doublet model. The potential is designed to accommodate CP violation in the scalar sector within a gauge theory, while at the same time allowing for natural ...