Beschreibung:
Astrophysical observations implying the existence of Dark Matter and Dark Energy, which are not described by the Standard Model (SM) of particle physics, have led to extensions of the SM predicting new particles that could be directly produced at the Large Hadron Collider (LHC) at CERN. Based on 2015 and 2016 ATLAS proton-proton collision data, this thesis presents searches for the supersymmetric partner of the top quark, for Dark Matter, and for DarkEnergy, in signatures with jets and missing transverse energy.
Introduction.- The theory of elementary particle physics.- The experimental setup.- Performance of muon reconstruction and identi¿cation.- Searches for new particles decaying into jets and missing transverse energy.- Summary.- Appendix.- Bibliography.