Heavy [Formula: see text] bosons in the secluded [Formula: see text] model at hadron colliders

We study [Formula: see text] phenomenology at hadron colliders in an [Formula: see text] extended MSSM. We choose a [Formula: see text] model with a secluded sector, where the tension between the electroweak scale and developing a large enough mass for [Formula: see text] is resolved by incorporating three additional singlet superfields into the model. We perform a detailed analysis of the production, followed by decays, including into supersymmetric particles, of a [Formula: see text] boson with mass between 4 and 5.2 TeV, with particular emphasis on its possible discovery. We select three different scenarios consistent with the latest available experimental data and relic density constraints, and concentrate on final signals with [Formula: see text] , [Formula: see text] and [Formula: see text] . Including the SM background from processes with two, three or four vector bosons, we show the likelihood of observing a [Formula: see text] boson is not promising for the HL-LHC at 14 TeV. While at 27 and 100 TeV, the situation is more optimistic, and we devise specific benchmark scenarios which could be observed.