Flynn, Jonathan M. and Nieves, Juan
Extracting |V(ub)| from B -> pi l nu decays using a multiply-subtracted Omnes dispersion relation
Physical Review D, 75, (1), . (doi:10.1103/PhysRevD.75.013008).
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We use a multiply-subtracted Omnès dispersion relation for the form factor f+ in B-->pi semileptonic decay, allowing the direct input of experimental and theoretical information to constrain its dependence on q2, thereby improving the precision of the extracted value of |Vub|. Apart from these inputs we use only unitarity and analyticity properties. We obtain |Vub|=(4.02±0.35)×10-3, improving the agreement with the value determined from inclusive methods, and competitive in precision with them.
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