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We present the first measurement of the ratio of branching fractions R identical withB(t--&gt;Wb)/B(t--&gt;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&gt;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.

physical review letters

First Measurement of the Ratio<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">B</mml:mi><mml:mo>(</mml:mo><mml:mi mathvariant="italic">t</mml:mi><mml:mi /><mml:mo>→</mml:mo><mml:mi /><mml:mi mathvariant="italic">Wb</mml:mi><mml:mo>)</mml:mo><mml:mi>/</mml:mi><mml:mi mathvariant="italic">B</mml:mi><mml:mo>(</mml:mo><mml:mi mathvariant="italic">t</mml:mi><mml:mi /><mml:mo>→</mml:mo><mml:mi /><mml:mi mathvariant="italic">Wq</mml:mi><mml:mo>)</…

First Measurement of the RatioB(t→Wb)/B(t→Wq)