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Radiative neutrino models and observational consequences
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
2011 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

We give a general introduction to physics, in particular the physics of the Standard Model (SM). Next we discuss one of the problems the SM faces, that of accommodating the neutrino masses. We discuss the concept of radiative mechanisms. Then we study three particular such models in depth.

The first is a model due to Ma which introduces three neutrino singlets and one scalar doublet on top of the SM particle content. We discuss the different neutrino masses that this model can hold. It is found that only case of normal hierarchy among the neutrinos is allowed in this model. We also discuss several observable quantities currently being searched for in experiments, and their relation to this model

The second model is due to Zee and Babu, and is commonly known as the Zee–Babu model. This model adds two electrically charged scalar particles to the SM. We find that this model can describe both the inverted hierarchy and normal hierarchy. The previously mentioned observable quantities are once again discussed, but with this model in mind.

Finally we discuss a model which accounts for the neutrino masses by assuming that there exists a fourth generation of leptons. It is found that this framework is insufficient to describe the observed neutrino masses.

Place, publisher, year, edition, pages
2011. , 46 p.
Trita-FYS, ISSN 0280-316X ; 49
Keyword [en]
Radiative mechanisms, scotogenic model, Zee–Babu model, fourth generation of leptons
National Category
Natural Sciences Physical Sciences
URN: urn:nbn:se:kth:diva-42593OAI: diva2:447347
Educational program
Master of Science in Engineering -Engineering Physics
Physics, Chemistry, Mathematics
Available from: 2011-10-12 Created: 2011-10-11 Last updated: 2011-10-12Bibliographically approved

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