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Renormalization Group Running of Fermion Observables in an Extended Non-Supersymmetric SO(10) Model
KTH, School of Engineering Sciences (SCI), Physics, Theoretical Particle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Theoretical Particle Physics.ORCID iD: 0000-0002-3525-8349
(English)Manuscript (preprint) (Other academic)
Abstract [en]

We investigate the renormalization group evolution of fermion masses, mixings and quartic scalar Higgs self-couplings in an extended non-supersymmetric SO(10) model, where the Higgs sector contains the 10H, 120H, and 126H representations. The group SO(10) is spontaneously broken at the GUT scale to the Pati-Salam group and subsequently to the Standard Model (SM) at an intermediate scale MI. We explicitly take into account the effects of the change of gauge groups in the evolution. In particular, we derive the renormalization group equations for the different Yukawa couplings. We find that the computed physical fermion observables can be successfully matched to the experimental measured values at the electroweak scale. Using the same Yukawa couplings at the GUT scale, the measured values of the fermion observables cannot be reproduced with a SM-like evolution, leading to differences in the numerical values up to around 80 %. Furthermore, a similar evolution can be performed for a minimal SO(10) model, where the Higgs sector consists of the 10H and 126H representations only, showing an equally good potential to describe the low-energy fermion observables. Finally, for both the extended and the minimal SO(10) models, we present predictions for the three Dirac and Majorana CP-violating phases as well as three effective neutrino mass parameters.

National Category
Subatomic Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:kth:diva-202305OAI: oai:DiVA.org:kth-202305DiVA, id: diva2:1075694
Note

QC 20170221

Available from: 2017-02-20 Created: 2017-02-20 Last updated: 2017-02-21Bibliographically 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. p. 98
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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https://arxiv.org/abs/1612.07973

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