eng URI http://hdl.handle.net/10795/3750 φυσικές και εφαρμοσμένες επιστήμες φυσικές επιστήμες πυρηνική φυσική στοιχειώδη σωματίδια This thesis presents searches for supersymmetry in the single-lepton _nal state, in proton-proton collisions at center of mass energies of 7 and 8 TeV, recorded by the CMS experiment at the LHC (CERN). The searches are motivated by supersymmetric models involving strong-production processes leading to large cascades of supersymetric particles. The single-lepton signature, accompanied with multiple jets and E/T, provides a clean signature in the hadronic environment of the LHC, while preserves large branching fraction for most of the supersymmetric models. No statistically significant deviations from the yields expected by the standard model are observed. Therefore, the results are interpreted in the context of various supersymmetric models with a pair production of gluinos, tightening the current limits on the mass of the gluino and the neutralino. 195 pp. LOMv1.0 creator LOMv1.0educational validator LOMv1.0 Scientific Coordinator LOMv1.0 Project Executing Organisation 2014 Digital Library of the Operational Programme "Education and Lifelong Learning" abstract types Text Single-lepton final state Supersymmetry Protons Proton collision Particle physics 10947060 application/pdf http://repository.edulll.gr/edulll/bitstream/10795/3750/2/3750_1.139_%ce%94%ce%94_15_5_14.pdf URI http://hdl.handle.net/10795/3750 LOMv1.0creator 2016-06-23T10:52:22Z LOMv1.0validator 2016-06-23T10:52:22Z LOMv1.0 gre no no Copyright EYD-EPEDBM (Operational Programme "Education and Lifelong Learning")