Direct Measurement of the Top Quark Mass
D0 Collaboration, S. Abachi
Abstract
We measure the top quark mass mt using t tbar pairs produced in the D0 detector by root(s) = 1.8 TeV p pbar collisions in a 125 pb-1 exposure at the Fermilab Tevatron. We make a two constraint fit to mt in t tbar --> b W+ bbar W- final states with one W decaying to q qbar and the other to e nu or mu nu. Events are binned in fit mass versus a measure of probability for events to be signal rather than background. Likelihood fits to the data yield mt = 173.3 +- 5.6 (stat) +- 6.2 (syst) GeV/c2.
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