PhD Thesis

Search for dark matter produced in association with a single top quark in $\sqrt{s}$=13 TeV $pp$ collisions with the ATLAS detector

Search for new phenomena in final states with b-jets and missing transverse momentum in $\sqrt{s}$ = 13 TeV pp collisions with the ATLAS detector

Search for direct production of electroweakinos in final states with one lepton, missing transverse momentum and a Higgs boson decaying into two b-jets in $pp$ collisions at $\sqrt{s}$ =13 TeV with the ATLAS detector

Search for bottom-squark pair production with the ATLAS detector in final states containing Higgs bosons, b-jets and missing transverse momentum