Model-Independent Semileptonic Form Factors Using Dispersion Relations

Details Model-Independent Semileptonic Form Factors Using Dispersion Relations Model-Independent Semileptonic Form Factors Using Dispersion Relations

1995-08-04

arxiv.org/abs/hep-ph/9508242v2

Nuovo Cim.A109:863-872,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

uses lanlmac(harvmac) and epsf, 12 pages, 1 eps figure included (Talk by BG at the 6-th International Symposium on Heavy Flavo

Scientific paper

10.1007/BF02823628

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.

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