Flynn, Jonathan M. and Nieves, Juan
|Vub| from exclusive semileptonic B?? decays
Physics Letters B, 649, (4), . (doi:10.1016/j.physletb.2007.04.028).
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We use Omnès representations of the form factors f+ and f0 for exclusive semileptonic B?? decays, paying special attention to the treatment of the B* pole and its effect on f+. We apply them to combine experimental partial branching fraction information with theoretical calculations of both form factors to extract |Vub|. The precision we achieve is competitive with the inclusive determination and we do not find a significant discrepancy between our result, |Vub|=(3.90±0.32±0.18)×10?3, and the inclusive world average value, (4.45±0.20±0.26)×10?3 [Heavy Flavor Averaging Group (HFAG), hep-ex/0603003].
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