The D0 collaboration has performed a measurement of the top quark mass based on six candidate events for the process t tbar -> b W+ bbar W-, where the W bosons decay to e nu or mu nu. This sample was collected during an exposure of the D0 detector to an integrated luminosity of 125 pb^-1 of sqrt(s)=1.8 TeV p-pbar collisions. We obtain mt = 168.4 +- 12.3 (stat) +- 3.7 (sys) GeV/c^2, consistent with the measurement obtained using single-lepton events. Combination of the single-lepton and dilepton results yields mt = 172.0 +- 7.5 GeV/c^2.Comment: 12 pages, 3 figure

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We measure the top quark mass m t using tt pairs produced in the DØ detector by √ s = 1.8 TeV pp collisions in a 125 pb −1 exposure at the Fermilab Tevatron. We make a two constraint fit to m t in tt → bW +b W − final states with one W decaying to qq and the other to eν or µν. 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 m t = 173.3 ± 5.6 (stat) ± 6.2 (syst) GeV/c 2 .Typeset using REVT E X * Authors listed on the following page.

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