W±W±H production at the HL-LHC and a 100 TeV pp-collider

W +/- W +/- H production at hadron colliders through vector boson scattering is a so far unconsidered process, which leads to a clean signature of two same-sign charged leptons and two widely separated jets. This process is sensitive to the HHH and WWHH couplings and any deviation of these couplings from their SM predictions serves as direct evidence of new physics beyond the SM. In this paper, we perform a Monte Carlo study of this process for the root s = 14 TeV LHC and a 100 TeV pp-collider, and provide projections of the constraints on the triple-Higgs and WWHH quartic couplings for these environments. In particular, we consider the impact of pileup on the expected sensitivity in this channel. Our analysis demonstrates that although the sensitivity to the HHH coupling is rather low, the WWHH coupling can be constrained in this channel within similar to 100% and similar to 20% at 95% confidence level around the SM prediction at the HL-LHC and a 100 TeV pp-collider, respectively. We have also provided results with simple truncation scheme, in consideration of unitarity safety.