Model-independent extraction of |Vcb| using dispersion relations

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

Research output: Contribution to journalArticlepeer-review

114 Scopus citations


We present a method for parametrizing heavy meson semileptonic form factors using dispersion relations, and from it produce a two-parameter description of the B → B elastic form factor. We use heavy quark symmetry to relate this function to B → D* lν form factors, and extract |Vcb| = 0.037-0.002+0.003 from experimental data w least squares fit. Our method eliminates model-dependent uncertainties inherent in choosing a parametrization for the extrapolation of the differential decay rate to threshold. The method also allows a description of B → Dlν form factors accurate to 1% in terms of two parameters.

Original languageEnglish (US)
Pages (from-to)306-312
Number of pages7
JournalPhysics Letters B
Issue number2-3
StatePublished - Jun 29 1995
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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