Measurement of the Top Quark Mass In All-Jet Events

Abstract

We describe a measurement of the mass of the top quark from the purely hadronic decay modes of t-tbar pairs using all-jet data produced in p-pbar collisions at sqrt{s} = 1.8 TeV at the Fermilab Tevatron Collider. The data, which correspond to an integrated luminosity of 110.2 pb^-1, were collected with the Dzero detector from 1992 to 1996. We find a top quark mass of 178.5 + 13.7 (stat) + 7.7(syst) GeV/c^2.

Figures (3)

• Figure 1: Histograms of kinematic variables for $t\overline{t}$ Monte Carlo signal (solid) and background (dashed) normalized to the same area. The Monte Carlo signal samples were generated with a top quark mass of 180 GeV/$c^2$. The variables are described in the text.
• Figure 2: (a) $D_{NN}$ is plotted for data and background. Also shown is the $D_{NN}$ expected for a 180 GeV/$c^2$ top quark Monte Carlo signal scaled up by a factor of ten. (b) $D_{NN}$ in finer bins from 0.90 to 1.05, for data, background and 180 GeV/$c^2$ top quark Monte Carlo signal scaled up by a factor of five.
• Figure 3: Data and the sum of background and Monte Carlo signal plotted as a function of the mean mass, $M$. Insert is $-\ln{L_{max}}$ as a function of the top quark mass.