First measurement of the ratio B(t ?? Wb)/B(t ?? Wq) and associated limit on the Cabibbo-Kobayashi-Maskawa element ?LVtb?L
Journal
Physical Review Letters
Journal Volume
86
Journal Issue
15
Pages
3233-3238
Date Issued
2001
Author(s)
Affolder, T. et al. (CDF Collaboration)
Abstract
We present the first measurement of the ratio of branching fractions R identical withB(t-->Wb)/B(t-->Wq) from p_p collisions at sqrt[s] = 1.8 TeV. The data set corresponds to 109 pb(-1) of data recorded by the Collider Detector at Fermilab during the 1992-95 Tevatron run. We measure R = 0.94(+0.31)(-0.24)(stat+syst) or R>0.61 (0.56) at 90% (95)% C.L., in agreement with the standard model predictions. This measurement yields a limit on the Cabibbo-Kobayashi-Maskawa quark mixing matrix element /V(tb)/ under the assumption of three generations and unitarity.
Type
journal article