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Measurement of the Absolute Branching Fraction of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>D</mml:mi><mml:mi>s</mml:mi><mml:mo>+</mml:mo></mml:msubsup><mml:mo>→</mml:mo><mml:msup><mml:mi>τ</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msub><mml:mi>ν</mml:mi><mml:mi>τ</mml:mi></mml:msub></mml:math>Decay
Using a sample of tagged D+s decays collected near the D*±sD∓s peak production energy in e+e− collisions with the CLEO-c detector, we study the leptonic decay D+s→τ+ντ via the decay channel τ+→e+νe¯ντ. We measure B(D+s→τ+ντ)=(6.17±0.71±0.34)%, where the first error is statistical and the second systematic. Combining this result with our …