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Title: Studies of electrons in the CMS detector and a proposed search for high invariant mass e⁺e⁻ pairs
Author: Evans, David Lewis
Awarding Body: University of Bristol
Current Institution: University of Bristol
Date of Award: 2009
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The Standard Model of particle physics is extremely well tested and yet is not believed to be a theory of everything. Many extensions of the Standard Model predict the existence of new particles. The Large Hadron Collider (LHC) is a high energy proton-proton collider which may be able to produce such particles. The Compact Muon Solenoid (CMS) experiment, a general purpose detector designed to measure the results of high energy proton-proton collisions at the LHC is described. In this work strategies have been developed to search for new physics by identifying high energy electrons produced by the decay of new particles. Detailed simulation programs have been used to test methods which may be used to identify events containing high energy electrons and record these for later study. The efficiency to record events containing an electron and a positron from the decay of a new particle with a mass of 1 Te V was improved from 70% to 99%. A new algorithm, which more robustly measures electron energy, was studied. Techniques to measure the performance of the criteria used to select events of particular interest have been studied, in addition to the level of contamination that may be present due to erroneously selected events. Using the methods developed, it has been shown that CMS could discover new particles that decay to electron-positron pairs up to a mass of 1.65 TeV using only 100 pb-1 of data. Models predicting spin-1 Z' particles and spin-2 Randall Sundrum gravitons have been considered and methods that could be used in early data to distinguish between these models have been investigated
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available