Search for New Physics in the Production of Di-Boson Resonances with the ATLAS Detector at the Large Hadron Collider

Despite all its success, the Standard Model of particle physics cannot explain some of the phenomena seen in Nature. Long-standing open questions, including the hierarchy problem, dark matter and electroweak baryogenesis motivate searches for new (heavy) particles. With the large amount of data collected during Run-2 of the Large Hadron Collider, searches for new particles predominantly decaying into pairs of bosons provide high sensitivity to physics beyond the Standard Model. The discovered Higgs boson is an example of a massive particle with significant branching fractions for decays into pairs of bosons. Its properties, are measured with increasing precision. Thus, the Higgs boson has become an ideal tool to conduct new-physics searches. This thesis, highlights recent searches by the ATLAS collaboration for di-boson resonances and anomalies in the Higgs boson couplings.