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We investigate the LHC phenomenology of a model where the Standard Model (SM)scalar sector is extended by two real scalar singlets. A$\mathbb{Z}_2\otimes\mathbb{Z}_2'$ discrete symmetry is imposed to reduce thenumber of scalar potential parameters, which is spontaneously broken by thevacuum expectation values of the singlet fields. As a result, all three neutralscalar fields mix, leading to three neutral CP-even scalar bosons, out of whichone is identified with the observed Higgs boson at 125 GeV. We explore allrelevant collider signatures of the three scalars in this model. Besides thesingle production of a scalar boson decaying directly to SM particle finalstates, we extensively discuss the possibility of resonant multi-scalarproduction. The latter includes decays of the produced scalar boson to twoidentical scalars ("symmetric decays"), as well as to two different scalars("asymmetric decays"). Furthermore, we discuss the possibility of successivedecays to the lightest scalar states ("cascade decays"), which lead toexperimentally spectacular three- and four-Higgs final states. We provide sixbenchmark scenarios for detailed experimental studies of these Higgs-to-Higgsdecay signatures.

Two-real-scalar-singlet extension of the SM: LHC phenomenology and benchmark scenarios