Precision Measurement of the Ratio B(t -> Wb)/B(t -> Wq) and Extraction of V-tb
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2011-09-15
Autores
Abazov, V. M.
Abbott, B.
Acharya, B. S.
Adams, M.
Adams, T.
Alexeev, G. D.
Alkhazov, G.
Alton, A.
Alverson, G.
Alves, G. A.
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Amer Physical Soc
Resumo
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 t (t) over bar final states. The measurement uses data from 5: 4 fb(-1) of p (p) over bar 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 vertical bar V-tb vertical bar as vertical bar V-tb vertical bar = 0.95 +/- 0.02, assuming unitarity of the 3 x 3 CKM matrix.
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Physical Review Letters. College Pk: Amer Physical Soc, v. 107, n. 12, p. 7, 2011.