Experimental Limits on Weak Annihilation Contributions to b -->u ell nu Decay
Abstract
We present the first experimental limits on high-q2 contributions to charmless 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-> Xu lnu. Using a wide range of models based on available theoretical input we set a limit of (GammaWA/Gammab->u) < 7.4% (90% confidence level) on the WA fraction, and assess the impact on previous inclusive determinations of |Vub|.
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