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B鈫?i>D(*) form factors from QCD light-cone sum rules

Author:
S. Faller   A. Khodjamirian   Ch. Klein and Th. Mannel  


Journal:
The European Physical Journal C - Particles and Fields


Issue Date:
2009


Abstract(summary):

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.


Page:
603-615


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