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

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

2006-11-09

arxiv.org/abs/hep-ph/0611113v1

Chin.Phys.Lett.24:61-64,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 3 figures

Scientific paper

10.1088/0256-307X/24/1/017

In this paper we calculate the weak form factors of the decays $B_c(B)\to Dl\tilde\nu$ 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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