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T: Fachverband Teilchenphysik
T 75: Higgs Physics VII
T 75.2: Vortrag
Donnerstag, 19. März 2026, 16:30–16:45, KH 01.019
Higgs self-coupling measurement from di-Higgs production at a future e+e- collider — •Julie Torndal1,2, Jenny List1, Bryan Bliewert1,2, Mikael Berggren1, Junping Tian3, Taikan Suehara3, Dimitris Ntounis4, and Caterina Vernieri4 — 1DESY, Harmburg, Germany — 2Universität Hamburg, Hamburg Germany — 3SLAC, Menlo Park, United States — 4The University of Tokyo, Tokyo, Japan
Linear e+e− colliders have the energy reach to directly access the Higgs self-coupling at tree-level through di-Higgs production while offering a clean experimental environment. At a centre-of-mass energy of 550 GeV, two processes contribute, who have different dependencies on the value of κλ offering a complementarity important for BSM scenarios. The leading contribution comes from Higgs strahlung, ZHH, with a small addition from the WW fusion. In this contribution, the ongoing analysis of the HH→4b channel will be presented using fast SGV (Simulation à Grande Vitesse) based simulation of the ILD (International Large Detector) concept with the full SM background. Improvements in flavour tagging and kinematic reconstruction will be discussed, and the status of the event selections using advanced machine learning techniques will be presented before evaluating the cross-section precisions for each channel and translating those into a precision on κλ for the SM and BSM case. The precise measurement of the Higgs self-coupling offers new insights central to the Higgs sector, in determining the shape of the Higgs potential and understanding the mechanism behind electroweak symmetry breaking.