Preprint

PUBDB-2026-00151

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Lattice investigation of custodial two-Higgs-doublet model at weak quartic couplings

Catumba, G. (Corresponding author) ; Hiraguchi, A. ; Hou, W.-S. ; Jansen, K.DESY* ; Kao, Y.-J. ; Lin, C. -J. D. ; Ramos, A. ; Sarkar, M.

2025

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Please use a persistent id in citations: doi:10.3204/PUBDB-2026-00151

Report No.: arXiv:2507.07759

Abstract: The SU(2)–gauged custodial two-Higgs-doublet model, which shares the same global-symmetry properties with the standard model, is studied non-perturbatively on the lattice. The additional Higgs doublet enlarges the scalar spectrum and opens the possibility for spontaneous breaking of the global symmetry. In this work we start by showing the occurrence of spontaneous breaking of the custodial symmetry in a region of the parameter space of the model. Following this, both the spectrum and the running of the gauge coupling of are examined at weak quartic couplings in the presence of the custodial symmetry. The calculations are performed with energy cutoffs ranging from 300 to 600 GeV on a line of constant standard model physics, obtained by tuning bare couplings to fix the ratio between the masses of the Higgs and the W bosons, as well as the value of the renormalized gauge coupling at the scale of the W boson mass. The realizable masses for the additional scalar states are explored. For the choice of bare quartic couplings in this work, the estimated lower bound of these masses is found to be well below the W boson mass, and independent of the cutoff. We also study the finite temperature electroweak transition along this line of constant standard model physics, revealing properties of a smooth crossover behavior.

Keyword(s): Multi-Higgs Models ; Other Lattice Field Theories ; Phase Transitions

Note: 28 pages, 13 figures. v2: edit to match published version

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Contributing Institute(s):

1. Centre f. Quantum Techno. a. Application (CQTA)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. QUEST - QUantum computing for Excellence in Science and Technology (101087126) (101087126)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2025

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Database coverage:
; ; Published

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article Catumba, G. (Corresponding author) ; Hiraguchi, A. ; Hou, W.-S. ; Jansen, K. (Corresponding author)DESY* ; Kao, Y.-J. ; Lin, C. -J. D. ; Ramos, A. ; Sarkar, M.
Lattice investigation of custodial two-Higgs-doublet model at weak quartic couplings
Journal of high energy physics 10(10), 214 (2025) [10.1007/JHEP10(2025)214]2025     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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