Davidovich, Iván A. (2018) Fenomenología de bosones pseudo Nambu-Goldstone a la escala del TeV. / Phenomenology of pseuno Nambu-Goldstone bosons at the TeV scale. Tesis Doctoral en Física, Universidad Nacional de Cuyo, Instituto Balseiro.
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Resumen en español
En este trabajo de tesis se exploran distintos modelos en los cuales el bosón de Higgs es una partícula compuesta, un bosón pseudo Nambu-Goldstone proveniente de una ruptura espontánea de simetría en un nuevo sector de física fuertemente interactuante. Se comienza por realizar una introducción a los elementos necesarios para la construcción de este tipo de teorías. Luego, se procede a la construcción de un primer modelo basado en el patrón de ruptura de simetría SO(5)/SO(4), que permite resolver las discrepancias entre teoría y experimentos en las mediciones de la asimetría delante-atrás del quark bottom. En el mismo se introducen compañeros compuestos para el quark bottom utilizando las representaciones 4 y 16 de SO(5). Se obtienen expresiones analíticas que permiten entender las correcciones generadas para los acoplamientos Zbb y se realizan cálculos numéricos que verifican la precisión de estas expresiones y muestran la existencia de regiones en el espacio de parámetros del modelo donde el mismo da una resolución realista al problema planteado. En el segundo modelo a considerar se introduce una ruptura espontánea de simetría SU(6)xSO(5)/SU(3)_LxSU(3)_RxSO(4) en el nuevo sector de la teoría. Esto produce la aparición de nuevos bosones de Nambu-Goldstone, además del Higgs, uno de los cuales adquiere de forma dinámica un valor de expectación en el vacío. Esto permite dar masa a los quarks y relajar las cotas para la escala de las resonancias compuestas de la teoría impuestas por la física de sabor, provenientes del parámetro є"K y los momentos dipolares del neutrón. Por último, se construye un modelo compuesto basado en el patrón de ruptura de simetría SO(6)/SO(4)xSO(2). El mismo posee dos dobletes complejos de Higgs. El modelo se construye de forma tal que se obtiene una ruptura controlada de la simetría custodial. Se derivan aproximaciones analíticas para las masas de los bosones de Higgs del modelo, así como para las mezclas entre ellos y sus acoplamientos. Todos los modelos estudiados presentan una rica fenomenología que resulta relevante para las búsquedas experimentales en aceleradores actuales y futuros.¹
Resumen en inglés
In this thesis we explore different models in which the Higgs boson is a composite particle, a pseudo Nambu-Goldstone boson that arises from a spontaneous symmetry breaking in a new sector of strongly coupled physics. We begin by giving an introduction to the tools and ideas that are necessary for building this kind of theories. Then we construct our first model, based on an SO(5)/SO(4) symmetry breaking pattern, which manages to solve the discrepancies between theory and experimental measurements of the forward-backward asymmetry of the bottom quark. In this model we introduce bottom partners embedded in the 4 and 16 representations of SO(5). We obtain analytical expressions that shed a light on the different contributions that are present for the Zbb coupling. Through numerical calculations we verify the accuracy of these expressions and show the existence of regions in parameter space where the model provides a realistic solution for the problem at hand. In our second model, we consider an SU(6)xSO(5)/SU(3)_LxSU(3)_RxSO(4) symmetry breaking for the new sector of the theory. This causes the appearance of new Nambu- Goldstone bosons, besides the Higgs, one of which acquires a non-zero vacuum expectation value dynamically. This gives masses to the quarks and relaxes the bounds imposed by flavor physics through the є"K parameter and the neutron dipole moments to the allowed masses for the composite resonances of the theory. Lastly, we consider a model built upon the SO(6)/SO(4)xSO(2) symmetry breaking pattern. This provides two complex Higgs doublets. The model is built in such a way that we obtain a controlled breaking of custodial symmetry.We provide analytical approximations for the masses of the Higgs bosons, as well as their mixings and couplings. All of the models built here have a rich phenomenology which is relevant for experimental searches in both current and future accelerators.²
| Tipo de objeto: | Tesis (Tesis Doctoral en Física) |
|---|---|
| Palabras Clave: | Bosons; Bosones; [Bosón de Higgs; Nambu-Goldstone] |
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| Materias: | Física > Física de partículas |
| Divisiones: | Investigación y aplicaciones no nucleares > Física > Partículas y campos |
| Código ID: | 870 |
| Depositado Por: | Tamara Cárcamo |
| Depositado En: | 26 Feb 2021 12:37 |
| Última Modificación: | 26 Feb 2021 12:37 |
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