New dynamics in axions and flavor

Tesis Doctoral inédita leída en la Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento de Física Teórica. Fecha de lectura: 25-10-2019 ; Despite the great success of the Standard Model of Particle Physics in describing Nature, it cannot account for some crucial experimental observations and theoretical issues. Therefore, the Standard Model requires to be extended. This thesis is devoted to the study of two of the theoretical issues: the absence of CP violation in the strong interactions, e.g. the strong CP problem, and the tantalizing pattern of masses and mixings of the elementary fermions, that is, the avor puzzle. For both problems, novel (ultraviolet complete) dynamical solutions are proposed. Complementarily, the model-independent techniques of e ective eld theories are applied to chart new territory in parameter space. In the avor arena, the leptonic avor symmetry of the Standard Model is gauged, promoting the Yukawa couplings to dynamical elds. The results of this theory are compared with those expected from the e ective ansatz of minimal avour violation. In the strong CP arena, two composite (dynamical) axion solutions to the strong CP problem are proposed: in a rst work the axion mass is raised in a framework with an uni ed strong sector, while in a second work an invisible axion with an accidental Peccei-Quinn symmetry is constructed. In addition, new regions in parameter space for the e ective couplings of axions and axionlike particles are explored. In particular, this thesis goes beyond the one-coupling-at-a-time approach, considering the simultaneous e ect of several e ective couplings: the axion coupling to electroweak gauge bosons and the gluonic coupling in the rst work, and the full bosonic electroweak basis for a generic axion-like particle without gluonic coupling in the second one. ; A pesar del gran exito del Modelo Est andar de la f sica de part culas a la hora de describir la naturaleza, todav a existan ciertas observaciones experimentales y enigmas te oricos que este ...