Simultaneous Measurement of the Ratio R = B(t → Wq) and the Top-Quark Pair Production Cross Section with the D0 Detector at √s = 1.96 TeV

Authors

V. M. Abazov, Joint Institute for Nuclear Research, Dubna, Russia
Gregory R. Snow, University of Nebraska-LincolnFollow
Kenneth A. Bloom, University of Nebraska-LincolnFollow
D0 Collaboration

Date of this Version

May 2008

Comments

Published by American Physical Society. Phys. Rev. Lett. 100, 192003 (2008). http://prl.aps.org. Copyright © 2008 American Physical Society. Permission to use.

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 σ_tt 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 σ_tt 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 σ_tt=8.18_-0.84^+0.90 (stat + syst) ± 0.50 (lumi) pb, in agreement with the standard model prediction.