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$B_c(B){\to}D l\tildeν$ form factors in Light-Cone Sum Rules and the $D$-meson distribution amplitude

Fen Zuo·Tao Huang
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Abstract

In this paper we calculate the weak form factors of the decays $B_c(B)\to Dl\tildeν$ by using the chiral current correlator within the framework of the QCD light-cone sum rules (LCSR). The expressions of the form factors only depend on the leading twist distribution amplitude (DA) of the $D$ meson. Three models of the $D$-meson distribution amplitude are employed and the calculated form factor $F_{B_c\to D}(0)$ is given. Our prediction, by using the $D$-meson distribution amplitude with the exponential suppression at the end points, is compatible with other approaches, and favors the three-points sum rules (3PSR) approach with the Coulumb corrections included.

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Fen Zuo, Tao Huang. 2006-11-09. $B_c(B){\to}D l\tildeν$ form factors in Light-Cone Sum Rules and the $D$-meson distribution amplitude. https://doi.org/10.1088/0256-307x%2F24%2F1%2F017

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