This thesis outlines the prospects for top quark mass measurement through the
Fully Hadronic decay of top-antitop events with the ATLAS detector. Methods with
and without b-tagging were explored. Without b-tagging the signal was hidden beneath
the QCD multi-jet background and prospects for a mass measurement do not
appear to be good. A standard and a pessimistic b-tagging likelihood significance
value were explored. The standard value gives a S/B of 0.88 and the more pessimistic
value gives a S/B of 0.79. For 1 fb−1 a significance of 36.8 and 32.0 can be obtained
for the standard and pessimistic scenarios respectively. A selection efficiency of 1.4%
and 1.1% can be achieved for the standard and pessimistic values respectively. Assuming
a top mass of 174 GeV, a mass peak can clearly be seen for both b-tagging
values. For the standard scenario, a top mass of 168.94 GeV with a statistical error
of 0.33 GeV can be extracted. With the pessimistic scenario, the extracted mass is
169.11 GeV with a statistical error of 0.36 GeV. This is the first attempt with fully
simulated events and therefore there are possibilities for improvement. This analysis
did not include b-jet energy scale correction.
| Identifer | oai:union.ndltd.org:uvic.ca/oai:dspace.library.uvic.ca:1828/1232 |
| Date | 29 October 2008 |
| Creators | Edmonds, Keith |
| Contributors | Lefebvre, Michel, McPherson, Robert A. |
| Source Sets | University of Victoria |
| Language | English, English |
| Detected Language | English |
| Type | Thesis |
| Rights | Available to the World Wide Web |
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