Search for new phenomena in events with one energetic jet and large missing transverse momentum in proton-proton collisions at $\sqrt{s}$=7 TeV and 8 TeV with the ATLAS detector

This thesis presents results on the search for new phenomena in mono-jet events using proton- proton collision data collected by the ATLAS experiment at LHC. The full 7 TeV dataset (recorded in 2010 and 2011) and nearly half of 8 TeV one (2012) have been used, and no deviation from the Standard Model predictions has been observed. The results have been interpreted in the context of the production of Weak Interactive Massive Particles (WIMPs), a model with Large Extra Dimensions (ADD), and the production of light gravitinos in association with a squark or a gluino in Supersymmetry. The results of this analysis led to two papers and two public notes within the ATLAS collaboration.