Ph.D. Thesis by Kirsten Anne Tollefson Advisor: Prof. Paul Tipton University of Rochester, Rochester, New York, 1997 Title ----- A Measurement of the Top Quark Mass Abstract -------- Presented here is a measurement of the top quark mass using a sample of t-tbar events which decay into a charged lepton, a neutrino, and four jets. This analysis separates the sample of t-tbar events into non-overlapping subsamples based on our ability to identify jets which originate from b quark decays. This sample was collected in p-pbar collisions at sqrt(s) = 1.8 TeV with the Collider Detector at Fermilab, and corresponds to an integrated luminosity of 109 +/- 7 pb^-1. The top quark mass is measured to be 175.9 +/- 4.8 (stat.) +/- 4.9 (syst.) GeV/c^2. Posted to /cdf/pub/thesis/cdf4615_tollefson_thesis.ps http://www-cdf.fnal.gov/thesis/cdf4615_tollefson_thesis.ps Posted by groer@fnald