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Unification of gauge couplings in radiative neutrino mass models
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.ORCID iD: 0000-0002-3525-8349
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
2016 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 9, 111Article in journal (Refereed) Published
Abstract [en]

We investigate the possibility of gauge coupling uni fi cation in various radiative neutrino mass models, which generate neutrino masses at one-and/or two-loop level. Renormalization group running of gauge couplings is performed analytically and numerically at one-and two-loop order, respectively. We study three representative classes of radiative neutrino mass models: (I) minimal ultraviolet completions of the dimension-7 Delta L = 2 operators which generate neutrino masses at one-and/or two-loop level without and with dark matter candidates, (II) models with dark matter which lead to neutrino masses at one-loop level and (III) models with particles in the adjoint representation of SU(3). In class (I), gauge couplings unify in a few models and adding dark matter amplifies the chances for uni fi cation. In class (II), about a quarter of the models admits gauge coupling uni fi cation. In class (III), none of the models leads to gauge coupling uni fi cation. Regarding the scale of uni fi cation, we find values between 10(14) GeV and 10(16) GeV for models belonging to class (I) without dark matter, whereas models in class (I) with dark matter as well as models of class (II) prefer values in the range 5.10(10) - 5.10(14) GeV.

Place, publisher, year, edition, pages
Springer, 2016. no 9, 111
Keyword [en]
GUT, Renormalization Group, Effective field theories, Neutrino physics
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-194473DOI: 10.1007/JHEP09(2016)111ISI: 000384605700001Scopus ID: 2-s2.0-84988514181OAI: oai:DiVA.org:kth-194473DiVA: diva2:1043671
Funder
Swedish Research Council, 621-2011-3985
Note

QC 20161031

Available from: 2016-10-31 Created: 2016-10-28 Last updated: 2017-02-20Bibliographically approved
In thesis
1. Phenomenology of neutrino properties, unification, and Higgs couplings beyond the Standard Model
Open this publication in new window or tab >>Phenomenology of neutrino properties, unification, and Higgs couplings beyond the Standard Model
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The vast majority of experiments in particle physics can be described by the Standard Model of particle physics (SM). However, there are indications for physics beyond it. The only experimentally demonstrated problem of the model is the difficulty to describe neutrino masses and leptonic mixing. There is a plethora of models that try to describe these phenomena and this thesis investigates several possibilities for new models, both full theories and effective frameworks.

 

The values of the parameters in a model are dependent on the energy scale and we say that the parameters run. The exact behavior of the running depends on the model and it provides a signature of the model. For a model defined at high energies it is necessary to run the parameters down to the electroweak scale in order to perform a comparison to the known values of observed quantities. In this thesis, we discuss renormalization group running in the context of extra dimensions and we provide an upper limit on the cutoff scale. We perform renormalization group running in two versions of a non-supersymmetric SO(10) model and we show that the SM parameters can be accommodated in both versions. In addition, we perform the running for the gauge couplings in a large set of radiative neutrino mass models and conclude that unification is possible in some of them.

 

The Higgs boson provides new possibilities to study physics beyond the SM. Its properties have to be tested with extremely high precision before it could be established whether the particle is truly the SM Higgs boson or not. In this thesis, we perform Bayesian parameter inference and model comparison. For models where the magnitude of the Higgs couplings is varied, we show that the SM is favored in comparison to all other models. Furthermore, we discuss lepton flavor violating processes in the context of the Zee model. We find that these can be sizeable and close to the experimental limits.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 98 p.
Series
TRITA-FYS, ISSN 0280-316X ; 2017:10
Keyword
Effective field theories, neutrino physics, extra dimensions, universal extra dimensions, Higgs physics, renormalization group running, Bayesian statistics, grand unified theories
National Category
Subatomic Physics
Research subject
Physics
Identifiers
urn:nbn:se:kth:diva-202311 (URN)978-91-7729-298-2 (ISBN)
Public defence
2017-03-24, FB53, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20170221

Available from: 2017-02-21 Created: 2017-02-20 Last updated: 2017-02-23Bibliographically approved

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