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arXiv 1306.0365hep-ph
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半轻子D衰变的形状因子

Form factors for semileptonic D decays

Teresa Palmer, Jan O. Eeg

摘要:

本文研究了$D$介子半轻子衰变的形状因子。也就是说,我们考虑跃迁$D \rightarrow P$和$D \rightarrow V$的弱左夸克流的矩阵元,其中$P$和$V$分别是轻赝标或矢量介子。我们对这些形状因子进行研究的动机是将来对非轻子衰变振幅的计算。本文研究了一类手征夸克模型的形状因子。特别地,我们研究了大能量有效理论(LEET)极限对$D$ -介子衰变的作用。与以前的工作相比,我们还在手征夸克模型中引入了光矢量介子$V = ρ, K^*,...$。为了确定我们模型中的一些参数,我们使用现有的数据和结果的基础上的一些其他方法,如晶格计算,光锥求和规则,和重轻手征微扰理论。我们还在我们的框架内得到了一些预测。

英文摘要:

We study the form factors for semileptonic decays of $D$-mesons. That is, we consider the matrix element of the weak left-handed quark current for the transitions $D \rightarrow P$ and $D \rightarrow V$, where $P$ and $V$ are light pseudoscalar or vector mesons, respectively. Our motivation to perform the present study of these form factors are future calculations of non-leptonic decay amplitudes. We consider the form factors within a class of chiral quark models. Especially, we study how the Large Energy Effective Theory (LEET) limit works for $D$-meson decays. Compared to previous work we also introduce light vector mesons $V = ρ, K^*,...$ within chiral quark models. In order to determine some of the parameters in our model, we use existing data and results based on some other methods like lattice calculations, light-cone sum rules, and heavy-light chiral perturbation theory. We also obtain some predictions within our framework.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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