Status around ILC/Higgs factories

• Taikan Suehara (ICEPP, The University of Tokyo)

Higgs Self-Coupling Determination at Future Higgs Factories

• Junping Tian (University of Tokyo)

Determining the Higgs self-coupling is a key milestone in particle physics, offering direct insight into the Higgs potential responsible for electroweak symmetry breaking. Precise measurements of this coupling are crucial for understanding the electroweak phase transition in the early universe and could provide a possible explanation for the matter-antimatter asymmetry. However, measuring the Higgs self-coupling remains a significant challenge at both the (HL-)LHC and future Higgs factories. In this talk, we explore the prospects of extracting the triple Higgs self-coupling via di-Higgs and single-Higgs processes at an e⁺e⁻ collider with center-of-mass energies up to 1 TeV. We outline a model-independent strategy for determining the Higgs self-coupling, present experimental analyses based on full detector simulations, and discuss potential avenues for improving measurement precision.