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A Phenomenological Analysis of the ΔEFT: Type-2 Seesaw Effective Field Theory


Ponce Díaz,  Xavier
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Ponce Díaz, X. (2021). A Phenomenological Analysis of the ΔEFT: Type-2 Seesaw Effective Field Theory. Master Thesis, Ruprecht-Karls-Universität, Heidelberg.

Cite as: http://hdl.handle.net/21.11116/0000-0009-41E4-C
In this thesis a phenomenological analysis of the type-2 seesaw mechanism effective field theory expansion is performed. A complete non-redundant basis is obtained and compared to the Warsaw basis. Then, three different approaches are used to study and constrain the different operators of the effective field theory. Firstly, the model is studied assuming much lower energies than the scale of the type-2 seesaw mass by looking at its contribution to the Wilson coefficients of the Warsaw basis. This analysis is extended to include dimension-5 operators of the type-2 effective field theory. The second approach consists in probing the contribution of these operators to standard model couplings. We also study the possibility of constraining these operators along with the Warsaw basis. The last approach consists of studying the impact of some operators to LHC searches for new particles. Some new interesting interactions of this model are pointed out, and an analysis is carried out by using CMS data. Finally, a brief overlook into possible ultraviolet completions of this model is discussed at the end of this thesis.