Phenomenology in multi-scalar extensions of the Standard Model

Astrid Ordell

Phenomenology in multi-scalar extensions of the Standard Model

Astrid Ordell

Forskningsoutput: Avhandling › Doktorsavhandling (sammanläggning)

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Sammanfattning

Denna sammanläggningsavhandling består av fyra artiklar, som alla berör olika utvidgningar av Standardmodellen (SM). De första två artiklarna behandlar en specifik, supersymmetrisk, storförenad teori (GUT), medan de senare två klassificerar alla anomali-fria instanser av 2-Higgs-dubblett modeller (2HDMs) med en gauge:ad abelsk symmetri.

Artikel I. I denna artikel presenterar vi en alternativ lösning för att undvika lepton massor jämförbara med GUT-skalan, i så kallade trinifikations-baserade GUT modeller (T-GUTs). Istället för att introducera ytterligare kopior av tri-tripletterna, vilket är den konventionella metoden, löses problemet genom att baka in symmetrierna i en E8 grupp.

Artikel II. Denna artikeln involverar en mer detaljerad studie av modellen föreslagen i Artikel I. Till dess framstående drag tillhör frånvaro av my-problemet och en universell Yukawa-koppling för alla kirala fermioner.

Artikel III. Här klassificerar vi alla anomali-fria instanser av en 2HDM med en gauge:ad abelsk symmetri och fermion-innehållet hos SM. De resulterande 11 modellerna är sedan jämförda mot en rad av experimentella restriktioner, från vilka vi identifierar de mest lovande instanserna.

Artikel IV. I denna artikel klassificerar vi igen alla anomali-fria instanser av en 2HDM med en gauge:ad abelsk symmetri, men denna gång inkluderas även två generationer av högerhänta neutriner. De högerhänta neutrinerna är inkorporerade för att introducera en mekanism för att ge massor till de vänsterhänta neutriner vi ser på låga energier, här via en typ-I gungbrädemekanisk. Totalt finns det 16 giltiga modeller, som alla jämförs, både för normal- och inverterad ordning. Två modeller identifieras som de mest lovande kandidaterna för vidare studier.

Originalspråk	engelska
Kvalifikation	Doktor
Handledare	Pasechnik, Roman, handledare
Tilldelningsdatum	2020 sep. 18
Utgivningsort	Media-Tryck, Lund
Förlag	Lund University
ISBN (tryckt)	978-91-7895-570-1
ISBN (elektroniskt)	978-91-7895-571-8
Status	Published - 2020

Bibliografisk information

Defence details

Date: 2020-09-18

Time: 10:00

Place: Lundmarksalen, Sölvegatan 27, Lund. Join via zoom: https://lu-se.zoom.us/j/66788720581?pwd=eHhYTWZIWHdYWWkwdUcwbk9LL0YzZz09 Lösenord: 497457

External reviewer(s)

Name: Miller, David

Title: Dr.

Affiliation: University of Glasgow

---

Ämnesklassifikation (UKÄ)

Subatomär fysik

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BSM, 2HDMs

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Astrid Ordell_WEBB

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Populärvetenskaplig_sammanfattning

4 Artikel i vetenskaplig tidskrift

Anomaly-free 2HDMs with a gauged Abelian symmetry and two generations of right-handed neutrinos
Ordell, A., Pasechnik, R. & Serodio, H., 2020 aug. 14, I: Physical Review D. 102, 3, 035016.
Forskningsoutput: Tidskriftsbidrag › Artikel i vetenskaplig tidskrift › Peer review

Öppen tillgång
Classification of anomaly-free 2HDMs with a gauged U (1)′ symmetry
Nottensteiner, F., Ordell, A., Pasechnik, R. & Serôdio, H., 2019 dec. 23, I: Physical Review D. 100, 11, 115038.
Forskningsoutput: Tidskriftsbidrag › Artikel i vetenskaplig tidskrift › Peer review

Öppen tillgång
Scale hierarchies, symmetry breaking, and particle spectra in SU(3)-family extended SUSY trinification
Camargo-Molina, J. E., Morais, A. P., Ordell, A., Pasechnik, R. & Wessén, J., 2019, I: Physical Review D. 99, 3, 035041.
Forskningsoutput: Tidskriftsbidrag › Artikel i vetenskaplig tidskrift › Peer review

Öppen tillgång

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@phdthesis{5f784616fe3143609478b9ad922afb53,

title = "Phenomenology in multi-scalar extensions of the Standard Model",

abstract = "This thesis is composed of four papers, which all treat various extensions to the Standard Model (SM). The first two papers concern a particular supersymmetric, grand-unified theory (GUT), while in the latter two, we classify anomaly-free implementations of two-Higgs doublet models (2HDM) with a gauged abelian symmetry. Paper I. In this paper, we present an alternative solution for avoiding GUT-scale lepton masses in so-called trinification based GUT-models (T-GUTs). Rather than introducing several copies of the tri-triplets, which is the conventional approach, we solve the issue by embedding the symmetries into an E8 group. Paper II. This paper involves a more detailed study of the model proposed in Paper I. Some of its features is an absence of the mu-problem and a universal Yukawa coupling for all chiral fermions. Paper III. Here, we classify all anomaly-free implementations of a 2HDM with a gauged Abelian symmetry and the SM fermion content. The resulting 11 models are then compared under a range of experimental bounds, from which we identify the most promising ones. Paper IV. In this paper, we again classify and compare all anomaly-free implementations of a 2HDM with a gauged Abelian symmetry, but this time around also including two generations of right-handed neutrinos. The right-handed neutrinos are incorporated to provide a mechanism for the neutrinos to obtain a mass, here via a type-I seesaw mechanism. In total, there are 16 valid models, which are all compared, both for normal- and inverted ordering. Two models are identified as the most promising candidates for future studies. ",

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author = "Astrid Ordell",

note = "Defence details Date: 2020-09-18 Time: 10:00 Place: Lundmarksalen, S{\"o}lvegatan 27, Lund. Join via zoom: https://lu-se.zoom.us/j/66788720581?pwd=eHhYTWZIWHdYWWkwdUcwbk9LL0YzZz09 L{\"o}senord: 497457 External reviewer(s) Name: Miller, David Title: Dr. Affiliation: University of Glasgow --- ",

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type = "Doctoral Thesis (compilation)",

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N1 - Defence details Date: 2020-09-18 Time: 10:00 Place: Lundmarksalen, Sölvegatan 27, Lund. Join via zoom: https://lu-se.zoom.us/j/66788720581?pwd=eHhYTWZIWHdYWWkwdUcwbk9LL0YzZz09 Lösenord: 497457 External reviewer(s) Name: Miller, David Title: Dr. Affiliation: University of Glasgow ---

PY - 2020

Y1 - 2020

N2 - This thesis is composed of four papers, which all treat various extensions to the Standard Model (SM). The first two papers concern a particular supersymmetric, grand-unified theory (GUT), while in the latter two, we classify anomaly-free implementations of two-Higgs doublet models (2HDM) with a gauged abelian symmetry. Paper I. In this paper, we present an alternative solution for avoiding GUT-scale lepton masses in so-called trinification based GUT-models (T-GUTs). Rather than introducing several copies of the tri-triplets, which is the conventional approach, we solve the issue by embedding the symmetries into an E8 group. Paper II. This paper involves a more detailed study of the model proposed in Paper I. Some of its features is an absence of the mu-problem and a universal Yukawa coupling for all chiral fermions. Paper III. Here, we classify all anomaly-free implementations of a 2HDM with a gauged Abelian symmetry and the SM fermion content. The resulting 11 models are then compared under a range of experimental bounds, from which we identify the most promising ones. Paper IV. In this paper, we again classify and compare all anomaly-free implementations of a 2HDM with a gauged Abelian symmetry, but this time around also including two generations of right-handed neutrinos. The right-handed neutrinos are incorporated to provide a mechanism for the neutrinos to obtain a mass, here via a type-I seesaw mechanism. In total, there are 16 valid models, which are all compared, both for normal- and inverted ordering. Two models are identified as the most promising candidates for future studies.

AB - This thesis is composed of four papers, which all treat various extensions to the Standard Model (SM). The first two papers concern a particular supersymmetric, grand-unified theory (GUT), while in the latter two, we classify anomaly-free implementations of two-Higgs doublet models (2HDM) with a gauged abelian symmetry. Paper I. In this paper, we present an alternative solution for avoiding GUT-scale lepton masses in so-called trinification based GUT-models (T-GUTs). Rather than introducing several copies of the tri-triplets, which is the conventional approach, we solve the issue by embedding the symmetries into an E8 group. Paper II. This paper involves a more detailed study of the model proposed in Paper I. Some of its features is an absence of the mu-problem and a universal Yukawa coupling for all chiral fermions. Paper III. Here, we classify all anomaly-free implementations of a 2HDM with a gauged Abelian symmetry and the SM fermion content. The resulting 11 models are then compared under a range of experimental bounds, from which we identify the most promising ones. Paper IV. In this paper, we again classify and compare all anomaly-free implementations of a 2HDM with a gauged Abelian symmetry, but this time around also including two generations of right-handed neutrinos. The right-handed neutrinos are incorporated to provide a mechanism for the neutrinos to obtain a mass, here via a type-I seesaw mechanism. In total, there are 16 valid models, which are all compared, both for normal- and inverted ordering. Two models are identified as the most promising candidates for future studies.

KW - BSM, 2HDMs

KW - Fysicumarkivet A:2020:Ordell

M3 - Doctoral Thesis (compilation)

SN - 978-91-7895-570-1

PB - Lund University

CY - Media-Tryck, Lund

ER -

Phenomenology in multi-scalar extensions of the Standard Model

Sammanfattning

Bibliografisk information

Ämnesklassifikation (UKÄ)

Fria nyckelord

Tillgång till dokument

Andra filer och länkar

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Forskningsoutput

Anomaly-free 2HDMs with a gauged Abelian symmetry and two generations of right-handed neutrinos

Classification of anomaly-free 2HDMs with a gauged U (1)′ symmetry

Scale hierarchies, symmetry breaking, and particle spectra in SU(3)-family extended SUSY trinification

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