PhD defense by Laure Berthier – Niels Bohr Institute - University of Copenhagen

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PhD defense by Laure Berthier

Ultraviolet extensions of particle physics 

The discovery of the Higgs boson in 2012 at the Large Hadron Collider completed the Standard Model field content. Many questions though remain unanswered by the Standard Model triggering a search for new physics. New physics could manifest itself at the Large Hadron Collider by the discovery of new particles. However, the lack of new resonances might suggest that these new particles are still out of reach which leaves us with few options. Two possibilities are explored in this thesis. The first is to study precision measurements which might indicate new physics as small deviations from the Standard Model predictions. The second is to construct an ultraviolet completion of the Standard Model which allows for a naturally light Higgs while maintaining a sizable hierarchy between the Higgs mass and the cutoff scale of the theory.