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dc.date.accessioned2015-10-29T12:37:46Z
dc.date.available2015-10-29T12:37:46Z
dc.date.issued2015
dc.identifier.urihttp://hdl.handle.net/10852/47565
dc.description.abstractIn this thesis we explore several physics scenarios based on the Minimal Supersymmetric Standard Model (MSSM) and its extension in terms of Rparity violation. We derive predictions for, and analyse results from, the ongoing experiments at the Large Hadron Collider (LHC). The important role played by statistics and parameter scanning techniques in analysis of large parameter spaces is emphasized. We investigate a class of models where the superpartners of the Higgs and electroweak bosons, the charginos and neutralinos, are nearly degenerate in mass. When R-parity is conserved, this degeneracy can potentially make the lightest chargino long-lived on the timescales of collider physics. However, through a Bayesian analysis of the relevant parameter space, we find that this possibility is disfavoured by current data. In models where R-parity violating interactions are included, supersymmetric particles can decay to final states involving only Standard Model particles. We demonstrate that a small chargino–neutralino mass difference in this case may lead to interesting signals in LHC searches, including resonances of three charged particles. Although the first run of the LHC produced no clear sign of physics beyond the Standard Model, some small, yet intriguing, excesses have been observed in the data. We investigate whether two excesses seen by the CMS and ATLAS experiments in searches for dileptons, jets and missing energy can be interpreted as early hints of supersymmetry. After taking into account the null-results of other LHC searches, we find that the supersymmetric scenarios considered are not viable explanations of the observed excesses.en_US
dc.language.isoenen_US
dc.relation.haspartPaper 1: N.-E. Bomark, A. Kvellestad, S. Lola, P. Osland and A. R. Raklev. Long lived charginos in Natural SUSY? Journal of High Energy Physics (JHEP) 2014(5:7). The paper is available in DUO: http://urn.nb.no/URN:NBN:no-47503
dc.relation.haspartPaper 2: N. E. Bomark, A. Kvellestad, S. Lola, P. Osland and A. R. Raklev. R-parity violating chargino decays at the LHC. Journal of High Energy Physics (JHEP) 2014:12. The paper is available in DUO: http://urn.nb.no/URN:NBN:no-47500
dc.relation.haspartPaper 3: B. Allanach, A. R. Raklev and A. Kvellestad. Interpreting a CMS excess in lljj + missing-transverse-momentum with the golden cascade of the minimal supersymmetric standard model. Phys. Rev. D91 (2015) 115022. The paper is available in DUO: http://urn.nb.no/URN:NBN:no-51622
dc.relation.haspartPaper 4: B. Allanach, A. R. Raklev and A. Kvellestad. Consistency of the recent ATLAS Z+ETmiss excess in a simplified general gauge mediation model. Phys. Rev. D91 (2015) 095016-1. The paper is available in DUO: http://urn.nb.no/URN:NBN:no-51623
dc.relation.urihttp://urn.nb.no/URN:NBN:no-47503
dc.relation.urihttp://urn.nb.no/URN:NBN:no-47500
dc.relation.urihttp://urn.nb.no/URN:NBN:no-51622
dc.relation.urihttp://urn.nb.no/URN:NBN:no-51623
dc.titleChasing SUSY Through Parameter Spaceen_US
dc.typeDoctoral dissertationen_US
dc.creator.authorKvellestad, Anders
dc.identifier.urnURN:NBN:no-51621
dc.type.documentDoktoravhandlingen_US
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/47565/1/1674-Kvellestad-avhandling.pdf


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