Journal Article/Contribution to a conference proceedings

PUBDB-2026-00756

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Higgs self-coupling measurement at a linear collider at 550 GeV

Berggren, M.DESY* ; Bliewert, B.Extern*DESY* ; List, J.DESY* ; Ntounis, D. ; Suehara, T. ; Tian, J. ; Torndal, J. M. (Corresponding author)DESY* ; Vernieri, C.

2026
Springer Heidelberg

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Please use a persistent id in citations: doi:10.1140/epjp/s13360-026-07697-3  doi:10.3204/PUBDB-2026-00756

Report No.: ILD-PHYS-PROC-2026-003; PUBDB-2026-00756; arXiv:2603.19884

Abstract: The Higgs mechanism is essential for the success of the Standard Model (SM) and can be experimentally verified with the determination of the Higgs self-coupling. As the simplest model of a Higgs potential, the SM provides a clear prediction of the Higgs self-coupling in terms of the Higgs boson mass and the vacuum expectation value. Any deviations would indicate physics beyond the SM and help guide extended Higgs models. At large enough centre-of-mass energies, double-Higgs production provides tree-level sensitivity to the trilinear Higgs self-coupling. At 550 GeV the leading production mode in ${\text {e}}^{+} {\text {e}}^{-}$ comes from di-Higgs strahlung with a small contribution from $\text {W} \text {W}$-fusion. The most up-to-date ILD projections are extrapolated based on a full simulation analysis from 2014 by incorporating expected improvements in flavour tagging and kinematic reconstruction for event selection and are presented in this contribution together with the ongoing re-analysis using fast SGV (Simulation a Grande Vitesse) simulations of the ILD detector concept on a full SM background including the aforementioned state-of-the-art reconstruction and analysis tools.

Note: Talk presented at the International Workshop on Future Linear Colliders (LCWS 2025), October 20-24 2025

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Contributing Institute(s):

1. Technol. zukünft. Teilchenph. Experim. (FTX)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. DFG project G:(GEPRIS)390833306 - EXC 2121: Das Quantisierte Universum II (390833306) (390833306)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2026

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Springer ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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