Electron identification and ZZ -->4l̳ (e̳, [mu]) cross section measurement with the CMS detector
Name
299063878-MIT.pdf
Description
Full printable version
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17.17 MB
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bf50a92dc5cad773332ccef265147a5c
Author(s)
Mooney, Michael Ryan
Advisor(s)
Christoph M. E. Paus.
Date Issued
2008
Publisher
Massachusetts Institute of Technology
Abstract
We perform multiple analyses using generator-level information in the Compact Muon Solenoid (CMS) detector at the Large Hadron Collider (LHC). In particular, we carry out three central investigations: the determination of electron efficiencies, electron fake rates, and ZZ -->4l(e, [mu]) cross sections. Reconstructed Z boson decays are used as a benchmark in association with our cut-based analysis. In the Z-->2e channel we find an overall electron efficiency of 77.0%± 1.3%, and electron fake rates are calculated to be (1.7 ± 0.5) . 10-3 and (0.6 ± 0.2) 10-3 for the photon jet and QCD channels, respectively. We calculate an expected total of 17 counts/fb-1 for ZZ-->4l, which we find to have a cross section of [sigma]zz-->4l = 180 ± 45 ± 6 fb (with statistical uncertainty listed before systematic uncertainty). From our analysis using generatorlevel information, we obtain a set of reconstruction-level techniques that will be useful once the LHC starts delivering pp collisions sometime in 2008.
Description
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2008.
In title on title page, "[mu]" appears as lower case Greek letter; and, double underscored "l" and "e" appear as script.
Includes bibliographical references (p. 61-64).
Subjects
Physics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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