Phys. Rev. Lett. 86, 3233 - 3238 (2001)

First Measurement of the Ratio B(t → Wb)/B(t → Wq) and Associated Limit on the Cabibbo-Kobayashi-Maskawa Element |V_tb|

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T. Affolder et al. (CDF Collaboration)
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Received 7 December 2000

We present the first measurement of the ratio of branching fractions R≡B(t→Wb)/B(t→Wq) from pp̅ 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_-0.24^+0.31(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.

URL: http://link.aps.org/doi/10.1103/PhysRevLett.86.3233
DOI: 10.1103/PhysRevLett.86.3233
PACS: 12.15.Hh, 13.85.Ni, 14.65.Ha

^* Now at Carnegie Mellon University, Pittsburgh, Pennsylvania 15213.

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Phys. Rev. Lett. 86, 3233 - 3238 (2001)

First Measurement of the Ratio B(t → Wb)/B(t → Wq) and Associated Limit on the Cabibbo-Kobayashi-Maskawa Element |Vtb|

First Measurement of the Ratio B(t → Wb)/B(t → Wq) and Associated Limit on the Cabibbo-Kobayashi-Maskawa Element |V_tb|