Model-independent semi-leptonic form factors using dispersion relations

C. G. Boyd; B. Grinstein; R. F. Lebed

doi:10.1007/bf02823628

Model-independent semi-leptonic form factors using dispersion relations

C. G. Boyd, B. Grinstein, R. F. Lebed

Research output: Contribution to journal › Article › peer-review

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Abstract

We present a method for parametrizing heavy-meson semi-leptonic 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*ℓv̄ 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.

Original language	English (US)
Pages (from-to)	863-872
Number of pages	10
Journal	Nuovo Cimento della Societa Italiana di Fisica A
Volume	109
Issue number	6
DOIs	https://doi.org/10.1007/bf02823628
State	Published - 1996
Externally published	Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Nuclear and High Energy Physics
Astronomy and Astrophysics

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10.1007/bf02823628

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abstract = "We present a method for parametrizing heavy-meson semi-leptonic 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{\=v} form factors, and extract |Vcb| = 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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AU - Grinstein, B.

AU - Lebed, R. F.

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AB - We present a method for parametrizing heavy-meson semi-leptonic 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*ℓv̄ form factors, and extract |Vcb| = 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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JF - La Rivista del Nuovo Cimento

IS - 6

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Model-independent semi-leptonic form factors using dispersion relations

Abstract

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