Preprint

PUBDB-2026-00214

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Z and Higgs factory implications of two Higgs doublets with first-order phase transitions

Anisha ; Arco, F.DESY* ; Di Noi, S. (Corresponding author) ; Englert, C. ; Mühlleitner, M.

2025

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Please use a persistent id in citations: doi:10.3204/PUBDB-2026-00214

Report No.: DESY-25-085; KA-TP-17-2025; arXiv:2506.18555

Abstract: We investigate the potential of future electron-positron colliders, such as FCC-ee and CEPC, to probe 2-Higgs-doublet models (2HDMs) that facilitate a strong first-order electroweak phase transition (SFOEWPT), a necessary condition for electroweak baryogenesis. Focusing on a 2HDM in the CP-conserving limit, we identify parameter regions consistent with an SFOEWPT and evaluate their compatibility with projected precision electroweak and Higgs measurements, as well as searches for exotic Higgs bosons. We show that radiative corrections to e$^{+}$e$^{−}$ → hZ production introduce deviations in the cross section that are resolvable with the anticipated sub-percent precision at lepton colliders even when experimental outcomes of the LHC and Z pole measurements are in agreement with the SM. This underscores the opportunities of a precision lepton collider to explore BSM quantum corrections to the Higgs sector more broadly.

Keyword(s): Electroweak Precision Physics ; Multi-Higgs Models ; Phase Transitions in the Early Universe

Note: J. High Energ. Phys. 2025, 179 (2025)

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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)390833306 - EXC 2121: Quantum Universe (390833306) (390833306)
3. DFG project G:(GEPRIS)491245950 - Open-Access-Publikationskosten / 2025-2027 / DESY Hamburg (491245950) (491245950)
4. DFG project G:(GEPRIS)396021762 - TRR 257: Phänomenologische Elementarteilchenphysik nach der Higgs-Entdeckung (396021762) (396021762)

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 Anisha ; Arco, F.DESY* ; Di Noi, S. (Corresponding author) ; Englert, C. ; Mühlleitner, M.
Z and Higgs factory implications of two Higgs doublets with first-order phase transitions
Journal of high energy physics 10(10), 179 (2025) [10.1007/JHEP10(2025)179]2025     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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