D^+→η(′)l+ν_l semileptonic decays in light-cone sum rules  

作　　者：李竞武 薛丹青 徐庆强 吴向尧 

机构地区：[1]Department of Physics, Xuzhou Normal University [2]Institute of Physics, Jilin Normal University

出　　处：《Chinese Physics C》2011年第6期519-524,共6页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (11047014)

摘　　要：We calculate the D → η transition form factor in light-cone sum rules by taking improved current correlators to avoid the pollution from the twist-3 wave function. We get consistent results of the D＋ → η^（＇）l＋νl decays with the experimental data. By comparing the difference between the results of the branching ratios of D＋ → η^（＇）l＋νl from a two-pole parameterization model and from a BZ parameterization model, we find that the two-pole model and the BZ model are comparably believable. One way is supposed for the determination of the η-η mixing angle from the dependence of the branching ratios of D＋ → η^（＇）l＋νl decays on the η-η mixing angle.We calculate the D → η transition form factor in light-cone sum rules by taking improved current correlators to avoid the pollution from the twist-3 wave function. We get consistent results of the D＋ → η^（＇）l＋νl decays with the experimental data. By comparing the difference between the results of the branching ratios of D＋ → η^（＇）l＋νl from a two-pole parameterization model and from a BZ parameterization model, we find that the two-pole model and the BZ model are comparably believable. One way is supposed for the determination of the η-η mixing angle from the dependence of the branching ratios of D＋ → η^（＇）l＋νl decays on the η-η mixing angle.

关 键 词：form factor chiral current correlator light-cone sum rules η-η mixing angle 

分 类 号：O572.32[理学—粒子物理与原子核物理]