Simultaneous measurement of the ratio B($to Wb$) /B($to Wq$) and the top quark pair production cross section with the D0 detector at $sqrts$ = 1.96-TeV

Abstract

We present the first simultaneous measurement of the ratio of branching fractions, R=B(t->Wb)/B(t->Wq), with q being a d, s, or b quark, and the top quark pair production cross section sigma_ttbar in the lepton plus jets channel using 0.9 fb-1 of ppbar collision data at sqrt(s)=1.96 TeV collected with the D0 detector. We extract R and sigma_ttbar by analyzing samples of events with 0, 1 and >= 2 identified b jets. We measure R = 0.97 _s160.09-0.08 (stat_s16syst) and sigma_ttbar = 8.18 _s160.90-0.84 (stat_s16syst)} _s16/-0.50 (lumi) pb, in agreement with the standard model prediction.