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We present the first experimental limits on high-q^2 contributions tocharmless semileptonic B decays of the form expected from the Weak Annihilation(WA) decay mechanism. Such contributions could bias determinations of |Vub|from inclusive measurements of B-> X_u lnu. Using a wide range of models basedon available theoretical input we set a limit of (Gamma_WA/Gamma_b->u) < 7.4%(90% confidence level) on the WA fraction, and assess the impact on previousinclusive determinations of |Vub|.

physical review letters

Experimental Limits on Weak Annihilation Contributions to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>b</mml:mi><mml:mo>→</mml:mo><mml:mi>u</mml:mi><mml:mi>l</mml:mi><mml:mi>ν</mml:mi></mml:math>Decays

Experimental Limits on Weak Annihilation Contributions tob→ulνDecays