Abstract
The Standard Model has been proven to be a solid theory that explains fundamental particles and their interactions, but it still leaves many open questions. Dark matter is one of the most perplexing missing pieces because no Standard Model candidate can explain its contribution to the total amount of energy density of the Universe.\r In this dissertation, we use data collected in proton-proton collisions corresponding to an integrated luminosity of 3.2 fb-1 and at center-of-mass energy of $\\sqrt{s}$ =13 TeV collected with the ATLAS detector at LHC in 2015. We look for a final state with jets plus missing transverse momentum. This large momentum imbalance is due to the recoiling of the jet against the dark matter particles which leave the detector without interacting. \r We interpret the results in terms of pair production of Weakly Interacting Massive Particles (WIMPs) as candidates for dark matter. We also consider an interpretation in terms of compactification of large extra spatial dimensions proposed in the Arkani-Hamed, Dimopoulos, and Dvali model (LED ADD) resulting in a Kaluza-Klein tower of massive graviton modes, and SUSY compressed scenarios from sbottom, stop, and squark decay.\r The limits on the cross section of dark matter versus dark matter mass are compared with limits from direct detection experiments, confirming that colliders can set more stringent limits in the low mass range where direct detections suffer from kinematic suppression.