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Experimental Particle and Astro-Particle Physics Seminar
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Europe/Zurich
Description
Abstract:
The keystone of the Standard Model (SM) is the Brout-Englert-Higgs (BEH) mechanism, which predicts the existence of the Higgs boson (H) particle, which was discovered by the ATLAS and CMS Collaborations at the CERN Large Hadron Collider (LHC). Despite the milestone of its discovery, a central property of the H is its self-coupling (λHHH), which is proportional to its mass and whose experimental evidence is yet to be obtained. The H self-coupling represents the final missing piece in the H characterisation effort, and measuring it is one of the major endeavours undertaken by the particle physics community.
Moreover, the H is thought to play an essential role in extending the SM to a more complete theory, and the exploration of the scalar sector of the SM currently represents the preferred avenue in the search for Beyond the SM (BSM) physics.
This talk will present the state of the art in the Effective Field Theory interpretation of HH searches. It will review the main ideas underlying the approaches that lead to the formulation of the Standard Model EFT (SMEFT) and Higgs EFT (HEFT) and give an overview of HH calculations in these two theories, discussing the main differences between them. Special attention will be devoted to the characterisation of the HEFT expansion, highlighting the impact of the EFT power counting on HH predictions.