Constraints on form factors for exclusive semileptonic heavy to light meson decays

C. Glenn Boyd, Benjamín Grinstein, Richard F. Lebed

Research output: Contribution to journalArticlepeer-review

186 Scopus citations

Abstract

We use rigorous QCD dispersion relations to derive model-independent bounds on the B̄→πlν̄, D→πl̄ν, and D→K̄l̄ν 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 fB≤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.

Original languageEnglish (US)
Pages (from-to)4603-4606
Number of pages4
JournalPhysical Review Letters
Volume74
Issue number23
DOIs
StatePublished - 1995
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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