Experimental Limits on Weak Annihilation Contributions to b -->u ell nu Decay

Details Experimental Limits on Weak Annihilation Contributions to b -->u ell nu Decay Experimental Limits on Weak Annihilation Contributions to b -->u ell nu Decay

2006-01-16

arxiv.org/abs/hep-ex/0601027v1

Phys.Rev.Lett.96:121801,2006

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2005/, Submitted to PRL

Scientific paper

10.1103/PhysRevLett.96.121801

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 |Vub| from inclusive measurements of B-> X_u lnu. 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 |Vub|.

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