Phenomenological and cosmological aspects of electroweak models beyond the standard model
- Autores: Clara Murgui Galvez
- Directores de la Tesis: Antonio Pich (dir. tes.), Pavel Fileviez Perez (codir. tes.)
- Lectura: En la Universitat de València ( España ) en 2020
- Idioma: español
- Tribunal Calificador de la Tesis: Gino Isidori (presid.), Verónica Sanz González (secret.), Geraldine Servant (voc.)
- Programa de doctorado: Programa Oficial de Doctorado en Física
- Materias:
- Enlaces
- Tesis en acceso abierto en: TESEO
- Resumen
The Standard Model of particle physics (SM) is the best theory that we have nowadays to understand nature. However, although it describes with high accuracy most phenomena we observe, there is evidence of physics beyond it which, supported by experimental observations, denote that the SM cannot be the ultimate theory and motivates us to seek for a theory that completes it:
-The origin of neutrino masses and their nature. We will describe their status and introduce the main mechanisms behind their mass generation in Chap. 1, their connection between their nature and the lepton number will be discussed in Chap. 5, while also in that chapter and in Chap. 6 we will study their interplay with other open problems such as dark matter or Grand Unified Theories (GUTs).
-The existence of dark matter (DM): DM will be introduced in Chap. 2, where two of the most appealing candidates will be presented: weak interacting massive particles and axions.
-Matter-antimatter asymmetry: One of the conditions required for this asymmetry to occur in the evolution of the universe is the violation of baryon number. In Chap. 3 and 4 we will introduce theories where such condition can be understood.
-The flavour B-anomalies: Puzzled by their possible origin, in Chap. 9 we perform a global fit to b to c transitions including as input the most updated values available. For that, we will adopt a bottom-up approach from an effective field theory point of view, presented in Chap. 8.
-The symmetries of the SM: The three forces in the SM suggest a common origin at high energies. In Chap. 6, as well as in Chap. 7, we present minimal realistic alternatives to the original model and their interplay with other problems for the SM such as neutrino masses, the existence of DM and the strong CP problem. There are accidental symmetries in the SM such as baryon and lepton numbers, that could suggest a local symmetry behind them. Those will be discussed in Chap. 3. In there, we will show that, by gauging these symmetries, very appealing connections between neutrino masses and DM appear. We show that cosmology forces the upper bound of these theories to be at maximum at the multi-TeV scale, what makes their phenomenology testable at the current or near future stages of colliders or direct detection or indirect detection DM experiments, as we will shown in Chaps. 3, 4 and 5.
-The strong CP problem: Axions will be discussed in Chap. 2 and their embedding in GUT theories in Chap. 7, where we will show that in their context the mass of the axion can be predicted.
The aforementioned topics, as shown above, might be deeply connected. The aim of this thesis is to explore extensions of the SM motivated connecting the different open problems presented under the guidance of simplicity, predictivity, and testability, which define the compass that we will take in this thesis to explore beyond the SM territories.
