2026-09-20T16:35:25Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/447592022-01-13T07:54:41Zcom_1721.1_7582com_1721.1_7581col_1721.1_131024
Christoph M. E. Paus.
Mooney, Michael Ryan
Massachusetts Institute of Technology. Dept. of Physics.
Massachusetts Institute of Technology. Department of Physics
2009-03-16T19:39:34Z
2009-03-16T19:39:34Z
2008
2008
http://hdl.handle.net/1721.1/44759
299063878
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).
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.
by Michael Ryan Mooney.
S.B.
64 p.
eng
Massachusetts Institute of Technology
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http://dspace.mit.edu/handle/1721.1/7582
Physics.
Electron identification and ZZ -->4l̳ (e̳, [mu]) cross section measurement with the CMS detector
Thesis
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<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.</Abstract>
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