We present a method for parametrizing heavy-meson semi-leptonic 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*ℓv̄ form factors, and extract |Vcb| = 0.0355+0.0029-0.0025 from experimental data with a least-squares fit. Our method eliminates model-dependent uncertainties inherent in choosing a parametrization for the extrapolation of the differential decay rate to threshold.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Nuclear and High Energy Physics
- Astronomy and Astrophysics