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Phenomenology of a Three Higgs Doublet Model with a U(1)xZ2 flavour symmetry

Padilla, Ian LU (2019) FYTM03 20191
Theoretical Particle Physics - Has been reorganised
Abstract
We have studied the main features and the phenomenological consistency of a family-nonuniversal Three Higgs Doublet Model (3HDM) with a softly broken U(1)xZ2 family symmetry that enforces the flavour hierarchies in the Standard Model (SM) while implementing a tree-level Flavour Changing Neutral Current (FCNC) suppression in a Branco-Grimus-Lavoura way. Furthermore, the alignment limit is imposed in the scalar sector to enforce the physical scalar spectrum to accommodate a SM-like Higgs boson. To verify the consistency of our model, we have performed numerical analyses to confront experimental data coming from Higgs searches, electroweak precision tests and quark flavour violating processes. We conclude that the model studied in this thesis... (More)
We have studied the main features and the phenomenological consistency of a family-nonuniversal Three Higgs Doublet Model (3HDM) with a softly broken U(1)xZ2 family symmetry that enforces the flavour hierarchies in the Standard Model (SM) while implementing a tree-level Flavour Changing Neutral Current (FCNC) suppression in a Branco-Grimus-Lavoura way. Furthermore, the alignment limit is imposed in the scalar sector to enforce the physical scalar spectrum to accommodate a SM-like Higgs boson. To verify the consistency of our model, we have performed numerical analyses to confront experimental data coming from Higgs searches, electroweak precision tests and quark flavour violating processes. We conclude that the model studied in this thesis is capable of suppressing dangerous FCNCs mediated by non-SM scalars. Furthermore, some scalars are found to be relatively light suggesting that the model succeeds in confronting flavour data even in the presence of scalars with masses around 300 GeV. Hence, the 3HDM presented in this thesis opens the door to direct searches for non-SM scalars at future runs of the LHC. (Less)
Popular Abstract
The Standard Model of Particle Physics represents the most complete and predictive model of particle physics that attempts to describe the interactions between the fundamental blocks of nature, such as leptons and quarks interacting with the Higgs boson. Although the Standard Model has proven to be a powerful tool for describing almost all current observations in particle physics, it still lacks strong arguments to explain the free parameters and the different hierarchies that appear for no clear reason. For a long time, many different types of models have been proposed to alleviate the lack of information that the SM offers about the origin of the masses and mixing angles. Motivated by this goal, it is crucial to further propose new... (More)
The Standard Model of Particle Physics represents the most complete and predictive model of particle physics that attempts to describe the interactions between the fundamental blocks of nature, such as leptons and quarks interacting with the Higgs boson. Although the Standard Model has proven to be a powerful tool for describing almost all current observations in particle physics, it still lacks strong arguments to explain the free parameters and the different hierarchies that appear for no clear reason. For a long time, many different types of models have been proposed to alleviate the lack of information that the SM offers about the origin of the masses and mixing angles. Motivated by this goal, it is crucial to further propose new models and verify if their predictive power is sufficient to become a strong candidate for a model that goes beyond the Standard Model. This thesis consists of verifying the consistency of a new type of Three Higgs Doublet Model, which could possibly shed light on some of the mysterious features of the Standard Model and unravel potential new physics. (Less)
Please use this url to cite or link to this publication:
author
Padilla, Ian LU
supervisor
organization
course
FYTM03 20191
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Phenomenology Physics Beyond the Standard Model Three Higgs Doublet Model Flavour Symmetry
report number
LU TP 19-18
language
English
id
8990946
date added to LUP
2019-07-22 10:41:17
date last changed
2019-07-22 10:41:17
@misc{8990946,
  abstract     = {{We have studied the main features and the phenomenological consistency of a family-nonuniversal Three Higgs Doublet Model (3HDM) with a softly broken U(1)xZ2 family symmetry that enforces the flavour hierarchies in the Standard Model (SM) while implementing a tree-level Flavour Changing Neutral Current (FCNC) suppression in a Branco-Grimus-Lavoura way. Furthermore, the alignment limit is imposed in the scalar sector to enforce the physical scalar spectrum to accommodate a SM-like Higgs boson. To verify the consistency of our model, we have performed numerical analyses to confront experimental data coming from Higgs searches, electroweak precision tests and quark flavour violating processes. We conclude that the model studied in this thesis is capable of suppressing dangerous FCNCs mediated by non-SM scalars. Furthermore, some scalars are found to be relatively light suggesting that the model succeeds in confronting flavour data even in the presence of scalars with masses around 300 GeV. Hence, the 3HDM presented in this thesis opens the door to direct searches for non-SM scalars at future runs of the LHC.}},
  author       = {{Padilla, Ian}},
  language     = {{eng}},
  note         = {{Student Paper}},
  title        = {{Phenomenology of a Three Higgs Doublet Model with a U(1)xZ2 flavour symmetry}},
  year         = {{2019}},
}