The DZero collider experiment at the Department of Energy's Fermilab has completed two preliminary measurements of the top quark mass using data from Run II of the Tevatron. The result—170.6 +/- 7.3 GeV/c2—is the most precise measurement of the top quark mass from Run II data to date. The Tevatron, where the top quark was discovered in 1995 by the DZero and CDF experiments, is still the only source of top quarks. Measuring the properties of the top quark in detail makes it possible to test theoretical predictions, such as the connections between the top, the W boson and predictions for the mass of a Higgs boson.
[Mike Perricone, 630/840-5678,mikep@fnal.gov]
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