Triple Higgs boson production with two heavy scalars at the LHC via a simplified approach

We investigate triple Higgs boson production at the CERN LHC, in models containing two new heavy neutral scalar particles. We apply a simplified factorized approach in the narrow-width approximation to double-resonant triple Higgs boson production, and demonstrate that relevant constraints can be derived on models with extended scalar sectors, during the high-luminosity phase of the LHC. We also find, within an explicit two-real-singlet model and for the cut-based 6 b -jet analysis considered here, that the double-resonant contribution captures the dominant features of the signal, while non-resonant components have a limited impact on the expected sensitivity. The method therefore provides a fast approximate framework for models in which triple Higgs boson production is dominated by a narrow double-resonant topology.