Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 48: BSM Higgs 2 (extended Higgs sectors)

T 48.7: Talk

Tuesday, March 5, 2024, 17:30–17:45, Geb. 30.41: HS 3

Effective Field Theories for Heavy Higgs Bosons in Standard Model Extensions — Stefan Dittmaier, •Sebastian Schuhmacher, and Maximilian Stahlhofen — Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Hermann-Herder-Straße 3, D-79104 Freiburg, Germany

We consider the extension of the Standard Model by a heavy, real Higgs singlet. In order to obtain a phenomenologically interesting low-energy effective theory, we define a specific decoupling limit. We integrate out the heavy degrees of freedom at the one-loop level directly in the path integral via functional methods, employing the background field method as well as the method of regions. Working in the mass-eigenfield basis we take mixing between the Higgs fields into account. Also the renormalization of the full UV model is performed. We generate the effective Lagrangian up to mass dimension six and discuss the possibility of matching it onto SMEFT/HEFT.

Keywords: Effective Field Theory; BSM physics; Renormalization; HEFT