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Type of Document Dissertation Author Lam, David Wai Kui Author's Email Address dlam@nd.edu URN etd-04172008-163122 Title Measurement of Top Quark Mass in the All Hadronic Channel in sqrt(s) = 1.96TeV, $par{p}$ Collisions at D0 Degree Doctor of Philosophy Department Physics Advisory Committee
Advisor Name Title Michael D. Hildreth Committee Chair Umesh Garg Committee Member Ikaros I. Bigi Committee Member John M. LoSecco Committee Member Keywords
- High Energy
- Ensemble test
- Likelihood
- Multivariate Analysis
- Standard Model
- QCD
- Particle Physics
Date of Defense 2008-04-10 Availability unrestricted Abstract A measeurement of the top quark mass in proton-antiproton collisions at $sqrt{s} = 1.96 TeV$ using $1040 fb^{-1}$ of data collected in D0 detector at Fermilab is presented. This analysis focuses on the all-hadronic decay mode of the top quark and therefore only events with six or more calorimeter jets in the final state are considered. The measured top masses in the six jets and seven or more jets events are:$m^{6j}_{top} = 187.3 ^{+6.4}_{-5.7} mbox{(stat.)} ^{+3.2}_{-4.0}
mbox{(syst.)} GeV/c^2$
$m^{7+j}_{top} = 173.8 ^{+9.4}_{-7.6} mbox{(stat.)} ^{+3.1}_{-7.4}
mbox{(syst.)} GeV/c^2$
The results from both cases can be combined to give:
$m_{top} = 183.6 ^{+5.3}_{-4.8} mbox{(stat.)} ^{+3.2}_{-4.6} mbox{(syst.)}
GeV/c^2$
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