Experimental limits on weak annihilation contributions to b -> ul nu decays
Besson, David Zeke
AMERICAN PHYSICAL SOC
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We present the first experimental limits on high-q(2) contributions to charmless semileptonic B decays of the form expected from the weak annihilation (WA) decay mechanism. Such contributions could bias determinations of vertical bar V(ub)vertical bar from inclusive measurements of B -> X(u)l nu. Using a wide range of models based on 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 previous inclusive determinations of vertical bar V(ub)vertical bar.
Rosner, JL, Adam, NE, et al. Experimental limits on weak annihilation contributions to b -> ul nu decays. PHYSICAL REVIEW LETTERS. March 2006. 96(12)
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