Bc(B)→Dl(v) Form Factors in Light-Cone Sum Rules and the D-Meson Distribution Amplitude

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2007,（1）
• 页码范围: 61-64
• 页数: 4页
• 语种: 英文

摘要

Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049We calculate the weak form factors of the decays Bc(B) → Dl(v) by using the chiral current correlator within the framework of the QCD light-cone sum rules (LCSRs). 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. Our prediction, by using the D-meson distribution amplitude with the exponential suppression at the end points, favours the three-points sum rule (3PSR) approach with the Coulomb corrections included, and is compatible with other approaches.