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We measure the top quark mass mₓ using tt pairs produced in the D0 detector by s0ex{0ex}=0ex{0ex}1. 8TeVpp collisions in a 125pb^-1 exposure at the Fermilab Tevatron. We make a two constraint fit to mₓ in ttbW^+bW^- final states with one W decaying to qq and the other to e or. 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 mₓ0ex{0ex}=0ex{0ex}173. 35. 6 (stat) 6. 2 (syst) GeV/c^2.
Abachi et al. (Mon,) studied this question.