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B→D (*) form factors from QCD light-cone sum rules

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Abstract

We derive new QCD sum rules for B→D and B→D * form factors. The underlying correlation functions are expanded near the light-cone in terms of B-meson distribution amplitudes defined in HQET, whereas the c-quark mass is kept finite. The leading-order contributions of two- and three-particle distribution amplitudes are taken into account. From the resulting light-cone sum rules we calculate all B→D (*) form factors in the region of small momentum transfer (maximal recoil). In the infinite heavy-quark mass limit the sum rules reduce to a single expression for the Isgur–Wise function. We compare our predictions with the form factors extracted from experimental B→(*) l ν l decay rates fitted to dispersive parameterizations.

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Authors and Affiliations

  1. Theoretische Physik 1, Fachbereich Physik, Universität Siegen, 57068, Siegen, Germany

    S. Faller, A. Khodjamirian, Ch. Klein & Th. Mannel

  2. Theory Division, Department of Physics, CERN, 1211, Geneva 23, Switzerland

    S. Faller

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  1. S. Faller
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  2. A. Khodjamirian
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  3. Ch. Klein
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  4. Th. Mannel
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Correspondence to A. Khodjamirian.

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Faller, S., Khodjamirian, A., Klein, C. et al. B→D (*) form factors from QCD light-cone sum rules. Eur. Phys. J. C 60, 603–615 (2009). https://doi.org/10.1140/epjc/s10052-009-0968-4

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  • DOI: https://doi.org/10.1140/epjc/s10052-009-0968-4

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