Elastic s-wave scattering phase shifts and |Vub| from lattice calculations of form factors for exclusive semileptonic decays


Flynn, Jonathan. M. and Nieves, Juan (2007) Elastic s-wave scattering phase shifts and |Vub| from lattice calculations of form factors for exclusive semileptonic decays In Proceedings of Science (POS) LATTICE 2007. Proceedings of Science., p. 352.

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Description/Abstract

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.

Item Type: Conference or Workshop Item (Paper)
Venue - Dates: The XXV International Symposium on Lattice Field Theory, 2007-07-30 - 2007-08-04
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Subjects: Q Science > QC Physics
ePrint ID: 57253
Date :
Date Event
August 2007Published
Date Deposited: 14 Aug 2008
Last Modified: 16 Apr 2017 17:39
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/57253

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