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A Search for Supersymmetry with Same-Sign Tau and Lepton Final States at the CMS Experiment

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Title: A Search for Supersymmetry with Same-Sign Tau and Lepton Final States at the CMS Experiment
Authors: Guneratne Bryer, Arlo Emrys
Item Type: Thesis or dissertation
Abstract: A search for Supersymmetry signals with Same-Sign Dileptons in the final state at the Large Hadron Collider is presented. The results are based on 976 pb-1 of pp collision data recorded by the Compact Muon Solenoid experiment at 7 TeV centre of mass energy. The analysis strategy for channels including a hadronically decaying τ (eτ, µτ, ττ ) is discussed in detail. The numbers of observed events are compatible with the expectation from Standard Model processes in all the considered channels with a total of 2.9 ± 1.7 predicted and 3 observed. An Upper Limit of total observed events from New Physics is extracted at the 95% Confidence Level and is equal to 5.8. The results are interpreted in the Constrained Minimal Supersymmetric Standard Model and a simplified Supersymmetry model favouring τ channels characterised by [Mathematical formula appears here. To view, please open pdf attachment]. A lower limit of 400 GeV on the gluino mass is set in the simplified model for neutralino masses up to 350 GeV, with the exception of the region around mğ ≈ mLSP. This exclusion extends to gluino masses of up to 620 GeV for neutralino masses of less than 100 GeV.
Issue Date: 2012
Date Awarded: Aug-2012
URI: http://hdl.handle.net/10044/1/10006
DOI: https://doi.org/10.25560/10006
Supervisor: Buchmuller, Oliver Ludwig
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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