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We describe a measurement of the mass of the top quark from the purely hadronic decay modes of tt¯ pairs using all-jet data produced in pp¯ collisions at s=1.8 TeV at the Fermilab Tevatron Collider. The data, which correspond to an integrated luminosity of 110.2±5.8 pb−1, were collected with the DØ detector from 1992 to 1996. We find a top quark mass of 178.5±13.7(stat)±7.7(syst) GeV/c2.
We present a search for electroweak production of single top quarks in ≈90 pb −1 of data collected with the DØ detector at the Fermilab Tevatron collider. Using arrays of neural networks to separate signals from backgrounds, we set upper limits on the cross sections of 17 pb for the s-channel process pp ̄→tb+X, and 22 pb for the t-channel process pp ̄→tqb+X, both at the 95% confidence level.
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