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In the supersymmetric models, the coannihilation of the neutralino DM with alighter supersymmetric particle provides a feasible way to accommodate theobserved cosmological DM relic density. Such a mechanism predicts a compressedspectrum of the neutralino DM and its coannihilating partner, which results inthe soft final states and makes the searches for sparticles challenging atcolliders. On the other hand, the abundance of the freeze-out neutralino DMusually increases as the DM mass becomes heavier. This implies an upper boundon the mass of the neutralino DM. Given these observations, we explore theHE-LHC coverage of the neutralino DM for the coannihilations. By analyzing theevents of the multijet with the missing transverse energy ($E^{miss}_T$), themonojet, the soft lepton pair plus $E^{miss}_T$, and the monojet plus ahadronic tau, we find that the neutralino DM mass can be excluded up to 2.6,1.7 and 0.8 TeV in the gluino, stop and wino coannihilations at the $2\sigma$level, respectively. However, there is still no sensitivity of the neutralinoDM in stau coannihilation at the HE-LHC, due to the small cross section of thedirect stau pair production and the low tagging efficiency of soft tau from thestau decay.

On the coverage of neutralino dark matter in coannihilations at the upgraded LHC