MODEL-INDEPENDENT DETERMINATIONS OF (B)OVER-BAR-]DL(NU)OVER-BAR, D-ASTERISK-L(NU)OVER-BAR FORM-FACTORS

We present non-perturbative, model-independent parametrizations of the individual QCD form factors relevant to (B) over bar --> D <l(v)over bar> and (B) over bar --> Dl(v) over bar decays. These results follow from dispersion relations and analyticity, without recourse to heavy quark symmetry, To describe a form factor with two percent accuracy, t hree parameters are necessary, one of which is its normalization at ze ro recoil, F(1). We combine the individual form factors using heavy qu ark symmetry to extract values for the product \ V-cb\ F(1) from (B) o ver bar --> D <l(v)over bar> data with negligible extrapolation uncer tainty.