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Lepton flavour violation, Yukawa unification and neutrino masses in supersymmetric unified models

Lepton flavour violation, Yukawa unification and neutrino masses in supersymmetric unified models
Lepton flavour violation, Yukawa unification and neutrino masses in supersymmetric unified models

We explore some phenomenological consequences of models based on supersymmetric extensions of the Standard Model. In particular, we focus on the Minimal Supersymmetric Standard Model supplemented by right-handed neutrinos in the context of the Pati-Salam SU(4)⊗SU(2)L SU(2)R Grand Unified Theory. We start by analysing the possibility of using Lepton Flavour Violation as a probe of physics beyond the Standard Model. We show that the μ → eγ and τ → μγ decays impose important constraints to the soft supersymmetric particles. Secondly, we investigate how third family Yukawa unification can be used to provide a window into the soft supersymmetry breaking Lagrangian. We show that, a successful top quark mass prediction requires that the supersymmetric corrections to the bottom quark mass are small which, in turn, imposes a distinct hierarchy between the soft breaking parameters. Finally, we explicitly construct a realistic model of quark, charged lepton and neutrino masses and mixing angles, based on the Pati-Salam gauge group supplemented by an abelian flavour symmetry, that can explain the large atmospheric neutrino mixing angle, suggested by the Super-Kamiokande data, and account for the large mixing angle Mikheyev-Smirnov-Wolfenstein solution to the solar neutrino problem.

University of Southampton
Oliveira, Jorge Miguel Da Silva Borges
52706962-2b6f-4851-a7d6-74773b061895
Oliveira, Jorge Miguel Da Silva Borges
52706962-2b6f-4851-a7d6-74773b061895

Oliveira, Jorge Miguel Da Silva Borges (2000) Lepton flavour violation, Yukawa unification and neutrino masses in supersymmetric unified models. University of Southampton, Doctoral Thesis.

Record type: Thesis (Doctoral)

Abstract

We explore some phenomenological consequences of models based on supersymmetric extensions of the Standard Model. In particular, we focus on the Minimal Supersymmetric Standard Model supplemented by right-handed neutrinos in the context of the Pati-Salam SU(4)⊗SU(2)L SU(2)R Grand Unified Theory. We start by analysing the possibility of using Lepton Flavour Violation as a probe of physics beyond the Standard Model. We show that the μ → eγ and τ → μγ decays impose important constraints to the soft supersymmetric particles. Secondly, we investigate how third family Yukawa unification can be used to provide a window into the soft supersymmetry breaking Lagrangian. We show that, a successful top quark mass prediction requires that the supersymmetric corrections to the bottom quark mass are small which, in turn, imposes a distinct hierarchy between the soft breaking parameters. Finally, we explicitly construct a realistic model of quark, charged lepton and neutrino masses and mixing angles, based on the Pati-Salam gauge group supplemented by an abelian flavour symmetry, that can explain the large atmospheric neutrino mixing angle, suggested by the Super-Kamiokande data, and account for the large mixing angle Mikheyev-Smirnov-Wolfenstein solution to the solar neutrino problem.

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Published date: 2000

Identifiers

Local EPrints ID: 464286
URI: http://eprints.soton.ac.uk/id/eprint/464286
PURE UUID: 36a574bf-593a-4b26-8982-9ffda3918b77

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Date deposited: 04 Jul 2022 21:56
Last modified: 16 Mar 2024 19:23

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Contributors

Author: Jorge Miguel Da Silva Borges Oliveira

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