Reaching towards higher masses of supersymmetric particles

This thesis presents an optimisation of the search for SUSY in final states with one tau lepton, jets and large missing transverse energy. The search is performed in proton-proton collisions at sqrt(s) = 8TeV corresponding to an integrated luminosity of 20.3 fb^(−1). The SUSY model considered is mSUGRA with parameter values: m0 and m1/2 are treated as grid parameters, A0 = −2m0, tan beta = 30 and mu>0. The event selection is optimised for maximal sensitivity to mSUGRA in the low m0, high m1/2 region of the mass plane. The result of the optimised analysis is interpreted in the mSUGRA model and a limit in the (m0, m1/2) plane is obtained. Values of m1/2 up to 640 GeV are excluded for low m0 and 300 GeV for high m0 ( 2000 GeV < m0 < 5400 GeV).