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A search for supersymmetry using the alphaT variable with the CMS detector and the impact of experimental searches for supersymmetry on supersymmetric parameter space

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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
Authors: Rogerson, Samuel
Item Type: Thesis or dissertation
Abstract: 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.
Content Version: Open Access
Issue Date: May-2013
Date Awarded: Dec-2013
URI: http://hdl.handle.net/10044/1/18398
DOI: https://doi.org/10.25560/18398
Supervisor: Buchmueller, Oliver
Colling, David
Sponsor/Funder: Science and Technology Facilities Council (Great Britain)
Department: Physics
Publisher: Imperial College London
Qualification Level: Doctoral
Qualification Name: Doctor of Philosophy (PhD)
Appears in Collections:Physics PhD theses



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