Göttingen 2025 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

T: Fachverband Teilchenphysik

T 67: Higgs Physics VII (HH and Trilinear Coupling)

T 67.4: Vortrag

Donnerstag, 3. April 2025, 17:00–17:15, ZHG104

Higgs self-coupling measurement at the ILC — •Bryan Bliewert^1,2, Julie Munch Torndal^1,2, and Jenny List¹ — ¹Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — ²Universität Hamburg, Hamburg, Germany

Measuring the Higgs self-coupling represents a cornerstone of the physics program of future colliders because it gives important insights into the shape of the Higgs potential. This contribution summarizes the updated projections for the determination of the Higgs self-coupling from di-Higgs production at future e⁺e⁻ colliders. In particular, we will present an update of the analysis of di-Higgs production at 500 GeV using full simulation of the ILD detector concept, incorporating advancements through state-of-the-art particle ID and flavor tagging as well as covering the HH → bbbb and Z → qq/e⁺e⁻/µ⁺µ⁻/νν channels. Based on the experience of previous analyzes, we extrapolate these to cover some of the remaining decay modes, e.g. H H → bb WW or Z → τ⁺τ⁻, as well as the contribution from the W W fusion production mode. We study the dependency of the results on the center-of-mass energy as well as on the value of the trilinear coupling realized in nature.

Keywords: self-coupling; ILD