Thesis

Testing Beyond the Standard Model Theories with extra scalars or vectors

• Call:

  PT-CERN Call 2022/2

• Academic Year:

  2022

• Domain:

  Astroparticle Physics

• Supervisor:

  Ivo de Medeiros Varzielas

• Co-Supervisor:

• Institution:

  Instituto Superior Técnico (Universidade de Lisboa)

• Host Institution:

  CFTP - Centro de Física Teórica de Partículas

• Abstract:

  Multi Higgs Doublet Models (MHDM) refer to theories that are an extension of the Standard Model (SM), which predicts the existence of more than one Higgs boson. These models are motivated by various reasons, such as providing candidate dark matter particles and predicting new phenomena that could be observed at high-energy colliders like the Large Hadron Collider (LHC). The Three Higgs Doublet Model (3HDM) is a specific variant of MHDMs which proposes the existence of three Higgs doublets instead of one, as in the SM. The 3HDM can be further divided into different types, depending on the Higgs doublets Yukawa interactions and the symmetry imposed on the scalar potential. Depending on the choice of model parameters, there can be distinct phenomenology, including tree-level flavor-changing neutral currents. We plan to study exact symmetries in the 3HDM and the effects of soft-breaking terms. We will also study new phenomena that could be observed at high-energy colliders like the Large Hadron Collider (LHC), such as additional scalar or pseudoscalar particles, in order to constrain the parameters of the models.