Talk (non-conference)

PUBDB-2025-01922

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Precision physics as a tool to investigate BSM Higgs models: from colliders to GW

Verduras Schaeidt, A. (Corresponding author)DESY*

2025

Abstract: Understanding the shape of the Higgs potential and the nature of electroweak symmetry breaking is a central goal of particle physics. Extensions of the Standard Model (SM) Higgs sector can lead to rich phenomenology, including modified Higgs self-couplings, new scalar states, and strong first-order phase transitions in the early Universe—potentially sourcing a stochastic gravitational wave background. Precision calculations, in particular loop corrections to Higgs self-interactions, play a key role in testing the viability of these BSM scenarios and connecting collider observables with cosmological signals.In this talk we will focus on two case studies: the real-singlet extension of the SM without a Z2\mathbb{Z}_2 symmetry (RxSM), and the Two-Higgs-Doublet Model (THDM). In the RxSM, we identify regions compatible with a strong first-order electroweak phase transition, compute the resulting gravitational wave signal for LISA, and assess the impact of one-loop corrections on di-Higgs production at the (HL-)LHC. In parallel, we investigate the leading two-loop corrections to trilinear Higgs couplings in the THDM and related models, emphasizing their relevance for precision tests and perturbative stability. Throughout, we highlight the complementarity between collider and gravitational wave signatures as tools to constrain BSM Higgs scenarios.

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. DFG project G:(GEPRIS)520070247 - Untersuchungen von Neue Physik mit generischen Präzisionsberechnungen (520070247) (520070247)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2025

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