论文标题
涉及张量介子
Two- and three-body hadronic decays of charmed mesons involving a tensor meson
论文作者
论文摘要
我们研究了tp $衰减的准体$ d \ d \ tp $ d $ d $衰减，分别通过中间张量共振，分别为$ t $和$ p $ teote tensor和pseudoscalar mesons。我们使用$ d \ to t $ to t $ transition形式的形式基于轻单元总和和协变量夸克模型来评估衰减率，而前者与当前数据达成了更好的协议。尽管在分解近似下，发射的介子是张量的介子消失的树木振幅，但与张量衰减常数$ f_t $成正比的贡献可以通过顶点和硬观众散制校正产生。我们还研究了张量介子的有限宽度效果，发现与三体$ b $衰减相反，张量介导的$ d $衰减受到严重影响，并且必须纠正狭窄的宽度近似。为了提取与准体$ d \ to tp $衰减相关的信息拓扑振幅，需要更多的实验数据。在数据中，$ d^+\ tof_2π^+$和$ d^+\ to \ bar k_2^{*0}π^+$分支分数不是自我一致的，并且需要进一步澄清。
We study the quasi-two-body $D\to TP$ decays and the three-body $D$ decays proceeding through intermediate tensor resonances, where $T$ and $P$ denote tensor and pseudoscalar mesons, respectively. We employ $D\to T$ transition form factors based upon light-cone sum rules and the covariant light-front quark model to evaluate the decay rates, with the former giving a better agreement with current data. Though the tree amplitudes with the emitted meson being a tensor meson vanish under factorization approximation, contributions proportional to the tensor decay constant $f_T$ can be produced from vertex and hard spectator-scattering corrections. We also investigate the finite-width effects of the tensor mesons and find that, contrary to three-body $B$ decays, the tensor-mediated $D$ decays are more seriously affected and the narrow width approximation has to be corrected. More experimental data are required in order to extract information topological amplitudes associated with quasi-two-body $D\to TP$ decays. Among the data, the $D^+\to f_2π^+$ and $D^+\to \bar K_2^{*0}π^+$ branching fractions are not self consistent and further clarification is called for.
