Model independent extraction of |V(cb)| using dispersion relations

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* l \nu form factors, and extract |V_{cb}|=0.037~{+0.003}_{-0.002} 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. The method also allows a description of B -> D l nu form factors accurate to 1% in terms of two parameters.

Note:

12 pages, 2 eps figures, uuencoded. Uses epsf and harvmac Report-no: UCSD/PTH 95-03

anti-B: semileptonic decay
semileptonic decay: anti-B
form factor: semileptonic decay
semileptonic decay: form factor
form factor: parametrization
parametrization: form factor
D*(2010)
CKM matrix matrix
quantum chromodynamics
dispersion relation

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