Precision Measurement of the Ratio B(t→Wb)/B(t→Wq) and Extraction of Vtb

Authors

V. M. Abazov, Joint Institute for Nuclear Research, Dubna, Russia
Kenneth A. Bloom, University of Nebraska-LincolnFollow
Daniel R. Claes, University of Nebraska-LincolnFollow
Kayle DeVaughan, University of Nebraska-Lincoln
Aaron Dominguez, University of Nebraska-LincolnFollow
Michael Eads, University of Nebraska-LincolnFollow
D. Johnston, University of Nebraska-LincolnFollow
Ioannis Katsanos, University of Nebraska-LincolnFollow
Sudhir Malik, University of Nebraska-LincolnFollow
Gregory Snow, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

2011

Citation

PHYSICAL REVIEW LETTERS 107, 121802 (2011); DOI: 10.1103/PhysRevLett.107.121802

Comments

Copyright 2011 American Physical Society

Abstract

We present a measurement of the ratio of top quark branching fractions R= B(t→Wb)/B(t→Wq), where q can be a d, s, or b quark, in the lepton + jets and dilepton tt̅ final states. The measurement uses data from 5.4 fb^-1 of pp̅ collisions collected with the D0 detector at the Fermilab Tevatron Collider. We measure R = 0.90±0.04, and we extract the Cabibbo-Kobayashi-Maskawa (CKM) matrix element │V_tb│ as │V_tb│= 0.95 ± 0.02, assuming unitarity of the 3X3 CKM matrix.