Constraints on form factors for exclusive semileptonic heavy to light meson decays
Journal Article
·
· Physical Review Letters
- Department of Physics, University of California, San Diego, La Jolla, California 92093-0319 (United States)
We use rigorous QCD dispersion relations to derive model-independent bounds on the {ital {bar B}}{r_arrow}{pi}{ital l}{bar {nu}}, {ital D}{r_arrow}{pi}{ital {bar l}}{nu}, and {ital D}{r_arrow}{ital {bar K}{bar l}}{nu} form factors. These bounds are particularly restrictive when the value of the observable form factor at one or more kinematic points is assumed. With reasonable assumptions we find {ital f}{sub {ital B}}{le}195 MeV and that the shape of the form factor becomes severely constrained. These constraints are useful both for model discrimination and for model-insensitive extraction of Cabibbo-Kobayashi-Maskawa mixing parameters.
- Research Organization:
- University of California
- DOE Contract Number:
- FG03-90ER40546
- OSTI ID:
- 69279
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 23 Vol. 74; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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