There is a recent e+e- Higgs factory proposal called HALHF, with the e-'s accelerated by plasma and the e+'s by a conventional accelerator. https://arxiv.org/a

There is a recent e+e- Higgs factory proposal called HALHF, with the e-'s accelerated by plasma and the e+'s by a conventional accelerator. https://arxiv.org/abs/2303.10150 https://arxiv.org/abs/2303.10150