Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 54: Higgs Physics VI

T 54.3: Talk

Wednesday, March 18, 2026, 16:45–17:00, KH 01.019

Precision predictions of partial decay widths in the general Two-Higgs-Doublet Model — •Jose Angel Hernandez Cuevas, Heidi Rzehak, Martin Gabelmann, and Robin Feser — Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany

The Standard Model (SM) of particle physics has achieved remarkable success in describing a broad spectrum of experimentally observed phenomena in particle physics with high precision. However, there are still some phenomena that lie beyond its description, such as the existence of dark matter, the matter-antimatter asymmetry of the universe, and the origin of neutrino masses. Several extensions to the SM have been proposed to account for these phenomena. Among them, the general Two-Higgs-Doublet Model (THDM) provides a framework with a rich phenomenology. It comprises the symmetry-constrained THDM scenarios as special limits, and enables the study of new sources of CP violation, Higgs-mediated flavor violation, generalized Yukawa structures, and the impact of complex parameters in both the potential and the Yukawa sector. In this talk, I will present next-to-leading-order (NLO) predictions of partial decay widths of the Higgs boson within the general THDM. I will focus on Higgs-boson decays into fermions and on exploring renormalization conditions, including on-shell and MS renormalization conditions, together with different tadpole treatments, in order to establish criteria that can point to a good choice of renormalization schemes for some extensions of the SM.

Keywords: Two-Higgs-Doublet Model; Higgs-boson decays; Next-to-leading-order corrections; Renormalization schemes; Fermionic decay channels