D0 top analyses: Recent results on the properties of the sixth quark

摘要

The D0 collaboration updates measurements of the Standard Model top quark in pp collisions at (radical)s = 1.8 TeV at the Fermilab Tevatron, with a new data sample of approximately twice the integrated luminosity used for the discovery measurements ((approximately)100 pb(sup -1)). We observe 37 t(bar t) candidate events from seven decay modes with an expected background of 13.4 (+-) 3.0 events. We present a preliminary new top mass measurement of 170 (+-) 15 (stat.) (+-)10 (syst.) GeV/c(sup 2) using the single-lepton + jets decay modes. For the central value of our measured mass we calculate the production cross section to be 5.2 (+-) 1.8 pb. D(O) is also analyzing additional decay modes and we report preliminary results from two new channels.