Doctoral Dissertations
Date of Award
Fall 2006
Document Type
Dissertation
Degree Name
Doctor of Philosophy (PhD)
Degree Program
Doctor of Philosophy in Physics
University
University of California, Berkeley
Department
Graduate Division
First Advisor
Professor Young-Kee, Co-Chair
Second Advisor
Professor James Siegrst, Co-Chair
Keywords
CDF, top quark, top quark mass, matrix element method, Tevatron, lepton plus jets, and jet energy scale
Subject Categories
Elementary Particles and Fields and String Theory | Physical Sciences and Mathematics | Physics
Abstract
We present a measurement of the mass of the top quark. Our event sample is selected from proton-antiproton collisions, at 1.96 TeV center-of-mass energy, observed with the CDF detector at Fermilab's Tevatron. We consider a 318 pb-1 dataset collected between March 2002 and August 2004. We select events that contain one energetic lepton, large missing transverse energy, exactly four energetic jets, and at least one displaced vertex b tag. Our analysis uses leading-order tt and background matrix elements along with parameterized parton showering to construct event-by-event likelihoods as a function of top quark mass. From the 63 events observed with the 318 pb-1 dataset we extract a top quark mass of 172.0 ± 2.6 (stat) ±3-3 (syst) GeV/c2 from the joint likelihood. The mean expected statistical uncertainty is 3.2 GeV/c2 for mt = 178 GeV/c2 and 3.1 GeV/c2 for mt = 172.5 GeV/c2. The systematic error is dominated by the uncertainty of the jet energy scale.
Recommended Citation
Gibson, A. P. (2006). A measurement of the top quark mass with a matrix element method (Doctoral dissertation). Retrieved from http://digitalcommons.imsa.edu/alumni_dissertations/15/
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