Revisiting D-mesontwist-2,3 distribution amplitudes  

作　　者：钟涛 黄冬 付海冰 Tao Zhong;Dong Huang;Hai-Bing Fu(Department of Physics,Guizhou Minzu University,Guiyang 550025,China;Department of Physics,Chongqing University,Chongqing 401331,China)

机构地区：[1]Department of Physics,Guizhou Minzu University,Guiyang 550025,China [2]Department of Physics,Chongqing University,Chongqing 401331,China

出　　处：《Chinese Physics C》2023年第5期73-81,共9页中国物理C（英文版）

基　　金：Supported in part by the National Natural Science Foundation of China(12265009,12265010);the Project of Guizhou Provincial Department of Science and Technology(ZK[2021]024,ZK[2023]142);the Project of Guizhou Provincial Department of Education(KY[2021]030);the Chongqing Graduate Research and Innovation Foundation(ydstd1912)。

摘　　要：Owing to the significant difference between the experimental measurements and the theoretical predictions of the standard model(SM)for the value of R(D)of the semileptonic decay B→Dtve,researchers speculate that this decay may be evidence of new physics beyond the SM.Usually,the D-meson twist-2,3 distribution amplitudes(DAs)Φ2;D(x,μ),d3:D(x,μ),and$g:D(x,μ)are the main error sources when perturbative QCD factorization and light-cone QCD sum rules are used to study B→Dtve.Therefore,it is important to obtain more reasonable and accurate behaviors for these DAs.Motivated by our previous work[Phys.Rev.D 104,no.1,016021(2021)]on pionic leading-twist DA,we revisit D-meson twist-2,3 DAsΦ2:D(x,μ),Φp3:D(x,μ),andΦσ3:D(x,μ).New sum rule formulae for the-moments of these three DAs are suggested for obtaining more accurate values.The light-cone harmonic oscillator models for the DAs are improved,and their parameters are determined by fitting the values of-moments via the least squares method.

关 键 词：meson distribution amplitude QCD sum rules semileptonic decay 

分 类 号：O572.33[理学—粒子物理与原子核物理]