Rossia, Alejo N. (2017) El bosón de higgis como un pseudo bosón de nambu-goldstone bosón: un modelo no minimal. / The higgs boson as a pseudo nambu-goldstone boson: a non-minimal model. Maestría en Ciencias Físicas, Universidad Nacional de Cuyo, Instituto Balseiro.
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Resumen en español
El sector del Higgs del Modelo Estandar presenta lo que se conoce como Problema de la Jerarquía. Los modelos de Higgs Compuesto son posibles soluciones no supersimétricas a dicho problema que han sido desarrollados intensivamente en la última década. En este trabajo se estudia un modelo no minimal de Higgs Compuesto. En el mismo hay un sector elemental idéntico al Modelo Estandar a excepción de la ausencia del Higgs y un sector compuesto formado por resonancias bosónicas y fermiónicas. Este sector compuesto tiene una simetría global SO (7) rota espontáneamente a SO (6). Los bosones de Nambu-Goldstone asociados a esa ruptura espontánea de simetría se identifican con el doblete del Higgs del Modelo Estandar y con un bosón escalar cargado adicional. La interacción entre los sectores elemental y compuesto de la teoría rompe explícitamente la simetría SO (7) y genera un potencial para los bosones de Nambu- Goldstone. En este trabajo se calcula dicho potencial en un modelo efectivo de 2 sitios y se estudia su dependencia con los parametros del sector compuesto. Se explora el espacio de parámetros de la teoría y se encuentran regiones fenomenológicamente aceptables. Se estudia el espectro de resonancias bosónicas y fermiónicas así como la influencia de las mezclas con partículas del sector compuesto sobre las masas del quark top, del quark bottom y de los bosones electrodebiles. Se encuentra que los acoplamientos del bosón de Higgs con los quarks top y bottom y con los bosones electrodebiles están suprimidos respecto al Modelo Estandar. También se encuentra una supresión respecto al Modelo Estandar en las amplitudes de los principales canales de producción y decaimiento del bosón de Higgs. En cambio, no se encuentran diferencias respecto al Modelo Estandar en los branching ratios de decaimiento del Higgs. Por último, se realiza un breve estudio de la fenomenología del bosón escalar cargado adicional.
Resumen en inglés
The Higgs sector of the Standard Model shows what is known as the Hierarchy Problem. Composite Higgs models are non-supersymmetric solutions to the Hierarchy Problem and they have been developed intensively during the last decade. In this thesis, a non-minimal Composite Higgs Model is studied. The model has an elementary sector which is equal to the Standard Model without the Higgs boson and a composite sector constituted by bosonic and fermionic resonances. The composite sector has an SO (7) global symmetry spontaneously broken to SO (6). The Nambu-Goldstone bosons related to that spontaneous breaking of the symmetry are identified as the Higgs doublet of the Standard Model plus an extra charged scalar boson. The interaction between the elementary and composite sectors breaks the global symmetry of the composite sector explicitly and generates a potential for the pseudo Nambu-Goldstone bosons. In this thesis that potential is calculated in a 2-site model and its dependence on the parameters of the composite sector is studied. The space of parameters is explored and phenomenologically suitable regions are found. The spectrum of bosonic and fermionic resonances and the influence of the mixes with resonances on the masses of the top and bottom quarks and the electroweak bosons is analyzed. The couplings between the Higgs boson and the top and bottom quarks and the electroweak bosons are found to be suppressed respect to the Standard Model. It is also found that the amplitudes of the main decay and production channels of the Higgs boson are suppressed respect to the Standard Model. On the other hand, the decay branching ratios do not suffer modifications. Finally, a brief analysis of the phenomenology of the extra charged scalar boson is performed.
| Tipo de objeto: | Tesis (Maestría en Ciencias Físicas) |
|---|---|
| Palabras Clave: | Bosons; Bosones; [Beyond standard model; Composite higgs; Higgs compuesto; Pseudo nambu-goldstone; Phenomenology; Fenomenología; Composite resonances; Resonancia compuestas] |
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| Materias: | Física > Física de partículas |
| Divisiones: | Investigación y aplicaciones no nucleares > Física > Partículas y campos |
| Código ID: | 655 |
| Depositado Por: | Tamara Cárcamo |
| Depositado En: | 26 Abr 2018 10:20 |
| Última Modificación: | 26 Abr 2018 11:28 |
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