  A multitude of searches have already been performed by the ATLAS and CMS
collaborations at the LHC to probe the heavy Higgses of the Minimal
Supersymmetric Standard Model (MSSM) through their decay to the Standard Model
particles. In this paper, we study the decay of the MSSM heavy Higgses into
neutralino and chargino pairs and estimate the maximum possible branching
ratios for these `ino' modes being consistent with the present LHC data. After
performing a random scan of the relevant electroweakino parameters, we impose
the SM 125 GeV Higgs constraints, low energy flavour data as well as current
bounds on heavy Higgses from the LHC run-I and run-II data. The present limits
on the electroweakino masses and couplings are also considered in our analysis.
We choose a few representative benchmark points satisfying all the
above-mentioned constraints, and then perform a detailed collider simulation,
including fast detector effects, and analyze all the potential SM backgrounds
in order to estimate the discovery reach of these heavy Higgses at the LHC. We
restrict ourselves within the leptonic cascade decay modes of these heavy
Higgses and study the mono-X + MET (X=W,Z) and trilepton + MET signatures in
the context of high luminosity run of the 14 TeV LHC.
