Model-Independent Semileptonic Form Factors Using Dispersion Relations

Abstract

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|=0.0355^{+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.

uses lanlmac(harvmac) and epsf, 12 pages, 1 eps figure included (Talk by BG at the 6-th International Symposium on Heavy Flavour Physics, Pisa, Italy, 6--10 June, 1995)

References in corpus (6)

• Constraints on Form Factors For Exclusive Semileptonic Heavy to Light Meson Decays
• Model-Independent Extraction of |V_{cb}| Using Dispersion Relations
• Measurement of the B -> D^* l nu Branching Fractions and |Vcb|
• $|V_{cb}|$ from OPE Sum Rules for Heavy Flavor Transitions
• Higher Order $1/m$ Corrections at Zero Recoil
• Analyticity Properties and Unitarity Constraints of Heavy Meson Form Factors

Cited by in corpus (2)

• Implications of unitarity and analyticity for the Dπform factors
• Dispersive Bounds on The Shape Of Lambda_b to Lambda_c l {\bar ν_l} Formfactors