Thesis

Constraining Multi-scalars models with colliders and Dark Matter

• Call:

  PT-CERN Call 2021/1

• Academic Year:

  2021

• Domain:

  Astroparticle Physics

• Supervisor:

  Joao Silva

• Co-Supervisor:

  Jorge Romão

• Institution:

  Instituto Superior Técnico (Universidade de Lisboa)

• Host Institution:

  CFTP - Centro de Física Teórica de Partículas

• Abstract:

  After the observation in 2012 of a new scalar particle closely resembling the Standard Model (SM) Higgs boson, the search for physics beyond the Standard Model (BSM) is now the main goal of the LHC experiments. Extensions of the scalar sector satisfying certain symmetries can provide a natural explanation for Dark Matter (DM) and new sources of CP-violation necessary to fulfil the three Sakharov criteria for baryogenesis. But the analysis of the theoretical constraints and restrictions placed by current data is incomplete for many such models. This project aims to develop theoretical methods to describe multi-scalar models and then confront the phenomenological implications with Higgs, Flavour, and Dark Matter experiments. Particular attention will be given to multi-component DM models. These studies will provide clear predictions and suggestions for future observations and are at the frontier of research.