Precision measurement of the ratio B(t -> Wb)/B(t -> Wq) and extraction of V.sub.tb./sub..

0367705 - FZÚ 2013 RIV US eng J - Journal Article
Abazov, V. M. - Abbott, B. - Acharya, B.S. - Kupčo, Alexander - Lokajíček, Miloš … Total 420 authors
Precision measurement of the ratio B(t -> Wb)/B(t -> Wq) and extraction of V_tb.
Physical Review Letters. Roč. 107, č. 12 (2011), "121802-1"-"121802-7". ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA MŠMT LA08047
Institutional research plan: CEZ:AV0Z10100502
Keywords : D0 * Tevatron * dilepton * unitarity * branching ratio
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 7.370, year: 2011

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.
Permanent Link: http://hdl.handle.net/11104/0202287