Enhanced Higgs pair production from higgsino decay at the HL-LHC

The scenario of multi-sector SUSY breaking predicts pseudo-goldstinos which are not absorbed by the gravitino and their mass can be as low ${{\cal O} (0.1)}$ GeV. Since interactions so weak gravitino, a produced higgsino decay to pseudo-goldstino plus Higgs boson insider detector at LHC, thus pair production lead signal missing energy. For natural requires rather light higgsinos, such events may sizably outnumber predicted SM accessible HL-LHC (14 TeV with luminosity 3~$\rm{ab}^{-1}$). In this work we examine observability energy from higgsinos HL-LHC. Considering three channels Higgs-pair ($bbWW^*$, $bb\gamma\gamma$, $bbbb$), our detailed Monte Carlo simulations for backgrounds show that best channel is $bbbb+\textrm{E\!\!\!\! \!\slash}_T$, whose statistical significance reach $2\sigma$ level allowed current experiments. This over result about $1.8\sigma$.