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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>)</…
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 …