Public Thesis defense - IRMP

Probing the Higgs potential at current and future colliders by Xiaoran ZHAO

Pour l’obtention du grade de Docteur en sciences

The Higgs boson provides unique opportunities for searching for phenomena which go beyond the Standard Model (SM). Among the least known properties of the scalar sector of the SM is the shape of Higgs potential.

In the SM, the cubic and quartic Higgs self-coupling are completely determined by the Fermi constant and the Higgs boson mass. Measuring the self-interactions is therefore essential to rst test the SM and then to interpret possible deviations. The overarching goal of this thesis is to present

a detailed study of the feasibility of measuring Higgs boson self-couplings at current and future colliders. One of main novelties is the systematic exploration of the possibility of accessing information on the self-couplings through eects that appear the rst time via loops. In particular, we establish a framework based on the eective eld theory approach that allows to consistently evaluate loop corrections in presence of deformations of the Higgs potential. This method allows to perform consistent computations and then to combine indirect constraints coming from loops to more di-

rect measurements. This study encompasses not only the current LHC and planned HL-LHC, but also a 100 TeV hadron collider, circular and linear e+e- colliders, and a futuristic muon collider.

Jury members :

• Prof. Fabio Maltoni (UCLouvain), supervisor
• Prof. Vincent Lemaitre (UCLouvain), chairperson
• Prof. Céline Degrande (UCLouvain), secretary
• Dr. Claude Duhr (CERN, Switzerland)
• Prof. Gudrun Heinrich (KIT, Germany)

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