Model-independent extraction of |Vcb| using dispersion relations

1995/04/06 by C. Glenn Boyd, Benjamı́n Grinstein, Benjamin Grinstein +1 · 8 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1016/0370-2693(95)00480-9

published as Phys.Lett.B353:306-312,1995 · 12 pages, 2 eps figures, uuencoded. Uses epsf.

arxiv created 1995/04/06 · openalex publication_date 1995/06/01 · arxiv updated 2010/11/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

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 νform 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.

Cited by

• Improved bounds for the slope and curvature of form factors
• Perturbative QCD study ofB→D(*)decays
• Measurement of theB¯<mml:mspace/>→<mml:mspace/>Dlν¯Partial Width and Form Factor Parameters
• New constraints on dispersive form factor parametrizations from the timelike region
• B→ρlν¯lform factors
• Model-independent investigation of the RJ/ψ,ηc and ratios of decay widths of semileptonic Bc decays into a P-wave charmonium
• Continuum limit of hyperon vector coupling f1(0) from 2+1 flavor domain wall QCD
• Model-independent extraction of |V| from B¯→D⁎ℓν‾