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Simultaneous measurement of the ratio B(t >Wb)/B(t >Wq) and the top quark pair production cross section with the D0 detector at sqrt(s)=1 96 TeV

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FIG. 1.(a) Probability ofdiscriminant distribution in the 0 tt� events to have 0, 1, and � 2 b tags as a function of R for events with � 4 jets; (b) predicted and observednumber of events in the 0, 1 and � 2 b tag samples for the measured R and �tt� for events with � 4 jets and (c) predicted and observed b tag sample with � 4 jets.
TABLE II.Summary of uncertainties on �tt� and R.

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