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Title: A search for supersymmetry with same-sign Tau and Lepton final states at the CMS experiment
Author: Guneratne Bryer, Arlo Emrys
ISNI:       0000 0004 2728 9676
Awarding Body: Imperial College London
Current Institution: Imperial College London
Date of Award: 2012
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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.
Supervisor: Buchmuller, Oliver Ludwig Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral