Preprint

PUBDB-2026-00029

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Assessing uncertainties in the determination of the trilinear Higgs self-coupling from single-Higgs observables

Bahl, H.DESY* ; Bechtle, P.Extern* ; Braathen, J.DESY* ; Heinemeyer, S. ; List, J.DESY* ; Vellasco, M. (Corresponding author) ; Weiglein, G.DESY*

2025

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Please use a persistent id in citations: doi:10.3204/PUBDB-2026-00029

Report No.: BONN-TH-2025-33; DESY-25-146; IFT-UAM/CSIC-25-152; arXiv:2512.02111

Abstract: Circular $e^{+}e^{-}$ colliders operating at energies below the di-Higgs production threshold can provide information on the trilinear Higgs self-coupling $λ_{hhh}$ via its loop contributions to single Higgs production processes and electroweak precision observables. We investigate how well a non-SM value of $λ_{hhh}$ can be determined indirectly via its loop contributions within a global EFT fit. Using an inert doublet extension of the SM Higgs sector as an example for a scenario of physics beyond the SM that could be realised in nature, we find that theoretical uncertainties related to the treatment of loop contributions and the truncation of the EFT expansion, which are usually neglected, play an important role in determining the sensitivity to $λ_{hhh}$ in a global fit. The results obtained from such an indirect determination of $λ_{hhh}$ without taking these additional uncertainties into account would be too optimistic, leading to an artificially high resulting precision for $λ_{hhh}$. They could therefore be misleading in the quest to precisely identify the underlying physics of electroweak symmetry breaking.

Note: 11 pages, 4 figures. Contribution to the proceedings of the European Physical Society Conference on High Energy Physics (EPS-HEP2025), 7-11 July 2025, Marseille, France

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Contributing Institute(s):

1. Theorie-Gruppe (T)
2. Technol. zukünft. Teilchenph. Experim. (FTX)

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)
3. DFG project G:(GEPRIS)390833306 - EXC 2121: Das Quantisierte Universum II (390833306) (390833306)
4. DFG project G:(GEPRIS)491245950 - Open-Access-Publikationskosten / 2025-2027 / DESY Hamburg (491245950) (491245950)

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/Contribution to a conference proceedings/Contribution to a book Bahl, H.DESY* ; Bechtle, P.Extern* ; Braathen, J. (Corresponding author)DESY* ; Heinemeyer, S.Extern* ; List, J.DESY* ; Vellasco, M. (Corresponding author) ; Weiglein, G.DESY*
Assessing uncertainties in the determination of the trilinear Higgs self-coupling from single-Higgs observables
2025Proceedings of The European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2025) - Sissa Medialab Trieste, Italy, 2026. - ISBN - doi:10.22323/1.485.0384
The European Physical Society Conference on High Energy Physics, (EPS-HEP2025), MarseilleMarseille, France, 7 Jul 2025 - 11 Jul 20252025-07-072025-07-11 Proceedings of Science / International School for Advanced Studies (EPS-HEP2025), 384 (2025) [10.22323/1.485.0384]2025     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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