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We explore signals of new physics with two Higgs bosons and large missingtransverse energy at the LHC. Such a signature is characteristic of models fordark matter or other secluded particles that couple to the standard modelthrough an extended scalar sector. Our goal is to provide search strategies andan interpretation framework for this new signature that are applicable to alarge class of models. To this end, we define simplified models of hiddensectors leading to two different event topologies: symmetric decay, i.e.,pair-produced mediators decaying each into a Higgs plus invisible final state;and di-Higgs resonance, i.e., resonant Higgs-pair production recoiling againsta pair of invisible particles. For both scenarios, we optimize the discoverypotential by performing a multi-variate analysis of final states with fourbottom quarks and missing energy, employing state-of-the-art machine learningalgorithms for signal-background discrimination. We determine the parameterspace that the LHC can test in both scenarios, thus facilitating aninterpretation of our results in terms of complete models. Di-Higgs productionwith missing energy is competitive with other missing energy searches and thusprovides a new opportunity to find hidden particles at the LHC.

Spotting hidden sectors with Higgs binoculars