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We consider two theoretical scenarios, each including a $\mathbb{Z}_{2}$-oddsector and leading to an elementary dark matter candidate. The first one is avariant of the Type-III seesaw model where one lepton triplet is$\mathbb{Z}_{2}$-odd, together with a heavy sterile neutrino. It leads to afermionic dark matter, together with the charged component of the triplet beinga quasi-stable particle which decays only via a higher-dimensional operatorsuppressed by a high scale. The second model consists of an inert scalardoublet together with a $\mathbb{Z}_{2}$-odd right-handed Majorana neutrinodark matter. A tiny Yukawa coupling delays the decay of the charged componentof the inert doublet into the dark matter candidate, making the formerlong-lived on the scale of collider detectors. The parameter space of eachmodel has been constrained by big-bang nucleosynthesis constraints, and also byestimating the contribution to the relic density through freeze-out of thelong-lived charged particle as well the freeze-in production of the dark mattercandidate. We consider two kinds of signals at the Large Hadron Collider forthe first kind of models, namely two charged tracks and single track + MET. Forthe second kind, the characteristic signals are opposite as well as same-signcharged track pairs. We perform a detailed analysis using event selectioncriteria consistent with the current experimental programmes. It is found thatthe scenario with a lepton triplet can be probed upto 960(1190) GeV with anintegrated luminosity of 300(3000) $fb^{-1}$, while the corresponding numbersfor the inert doublet scenario are 630(800) GeV. Furthermore, the second kindof signal mentioned in each case allows us to differentiate different darkmatter scenarios from each other.

Heavy stable charged tracks as signatures of non-thermal dark matter at the LHC : a study in some non-supersymmetric scenarios