Improved Unitarity Bounds for B -> Pi Decays

Details Improved Unitarity Bounds for B -> Pi Decays Improved Unitarity Bounds for B -> Pi Decays

1998-05-22

arxiv.org/abs/hep-ph/9805425v2

Nucl.Phys. B535 (1998) 372-386

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 10 Postscript figures, uses espf. Minor modifications, two references added and aknowledgements changed. The complet

Scientific paper

10.1016/S0550-3213(98)00618-X

We obtain model independent bounds for the form factors which arise in semileptonic B -> Pi decays. To this end we derive a theoretical restriction for possible combinations of the value of the form factor and its derivatives at the endpoint region. These restrictions are then used as an input in a - slightly modified - general formalism, which has already been deduced and applied in earlier publications. Our results can be used to set constraints on the form factors which have to be obeyed by all model dependent parametrizations.

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