The Muon Detection System and W Z --> 3l̳(e̳, [mu]) cross section measurement at CMS
Name
299062071-MIT.pdf
Description
Full printable version
Size
11.56 MB
Format
Adobe PDF
Checksum (MD5)
46b8111e390343c37c688fa05461f807
Author(s)
Melachrinos, Constantinos
Advisor(s)
Christoph M.E. Paus.
Date Issued
2008
Publisher
Massachusetts Institute of Technology
Abstract
The startup of the Large Hadron Collider will allow scientists to probe energy scales that existed picoseconds after the Big Bang. Monte Carlo samples of many Standard Model processes are produced to simulate the conditions in the Compact Muon Solenoid detector. Data analysis techniques are developed to measure the cross section of the W Z --> 3l(e, [mu]) decay channel. The results are [sgima]all = 723.4 ± 27.6(stat.) ± 144.7(syst.) fb for integrated luminosity 1 fb-1. Cross section measurements deduced by our data analysis techniques agree with the theoretical predictions, [sigma] pred. all = 708 ± 26.6 fb. The selection of W Z --> 3l events gave 43.5 ± 6.6 signal events with 6.4 ± 2.5 background events, enough to claim an observation at the level of five standard deviations. The understanding of this process will aid in the search for the Higgs boson, as well as in the search for new physics in the early stages of the operation of the detector.
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. 57-59).
Subjects
Physics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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