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Title: A search for supersymmetry using the alphaT variable with the CMS detector and the impact of experimental searches for supersymmetry on supersymmetric parameter space
Author: Rogerson, Samuel
Awarding Body: Imperial College London
Current Institution: Imperial College London
Date of Award: 2013
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A search for supersymmetry in final states with jets and missing transverse energy is performed in pp collisions at a centre-of-mass energy of sqrt(s)=7TeV. The data sample corresponds to 4.98fb^-1 collected by the CMS experiment at the LHC in 2011. A dimensionless kinematic variable is used as the main discriminant between genuine and misreconstructed signal events. The search is performed in a signal region binned according to the scalar sum of the transverse energy of jets and the number of jets identified as originating from a bottom quark. The limits are presented in the parameter space of the cMSSM as well as in simplified models with particular attention paid to compressed spectra and third-generation models. Global frequentist fits to the cMSSM} and a non-universal Higgs model are also performed using the Mastercode framework incorporating recent experimental constraints, similar to those those presented here. Global likelihood contours are presented in the parameter planes of both the cMSSM and NUHM1, as well as a selection of 1D likelihood functions for observables.
Supervisor: Buchmueller, Oliver ; Colling, David Sponsor: Science and Technology Facilities Council
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available