Speaker
Description
As a milestone in the physics program of future lepton colliders, the process of double Higgs-strahlung ee → ZHH allows direct access to the Higgs self-coupling at energies above ≈ 450 GeV. The last full evaluation of measuring this process at a conter-of-mass energy of 500 GeV is more than 10 years old, and many of the reconstruction tools have received major improvements since, including flavor tagging using machine-learning and improved tagging of isolated leptons. This contribution will present the current status of the updated ZHH projections with the International Large Detector (ILD) assuming multiple center-of-mass energies between 500-600 GeV and incorporating state-of-the-art reconstruction tools. Furthermore, the interplay with single-Higgs measurements and the vvHH channel will be discussed, in particular in extended Higgs models. Furthermore, an outlook for this analysis until the input to the next European Particle Physics Strategy Update is given.
