Research Papers in Physics and Astronomy


Date of this Version

May 2008


Published by American Physical Society. Phys. Rev. Lett. 100, 192003 (2008). Copyright © 2008 American Physical Society. Permission to use.


We present the first simultaneous measurement of the ratio of branching fractions, R = B(tWb)/B(tWq), with q being a d, s, or b quark, and the top-quark pair production cross section σtt in the lepton plus jets channel using 0.9 fb-1 of pp collision data at √s = 1.96 TeV collected with the D0 detector. We extract R and σtt by analyzing samples of events with 0, 1, and ≥ 2 identified b jets. We measure R=0.97-0.08+0.09(stat + syst) and σtt=8.18-0.84+0.90 (stat + syst) ± 0.50 (lumi) pb, in agreement with the standard model prediction.

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