Flynn, Jonathan. M. and Nieves, Juan
Elastic s-wave scattering phase shifts and |Vub| from lattice calculations of form factors for exclusive semileptonic decays.
Proceedings of Science (POS) LATTICE 2007.
The XXV International Symposium on Lattice Field Theory
Proceedings of Science.
Full text not available from this repository.
Omnès dispersion relations make a connection between form factors for exclusive semileptonic
decays and phase shifts in the corresponding elastic scattering channels. We describe two applications.
In the first, we use lattice form factor calculations to learn about phase shifts in elastic
s-wave isospin-1/2 channels for Kp , Bp , Dp and DK scattering. The aim of the second application
is to make the determination of the CKM matrix element magnitude |Vub| from exclusive
semileptonic B?p decays competitive with that from inclusive decays. Here we use many subtractions
in an Omnès dispersion relation to motivate a simple fitting function, allowing data to
constrain the q2 shape of the differential decay rate and theory, primarily lattice results, to provide
normalisation via form factor values.
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