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arXiv 1903.00860hep-ph
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LCSR中的半轻子$D_{(s)} \to A \ell^+ ν$和非轻子$D\to K_1(1270,1400) π$衰变

Semileptonic $D_{(s)} \to A \ell^+ ν$ and nonleptonic $D\to K_1(1270,1400) π$ decays in LCSR

S. Momeni, R. Khosravi

备注：
17 pages, 4 figures
发表信息：
J. Phys. G: Nucl. Part. Phys. 46, 105006 (2019)
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摘要：

本文计算了半轻子$D_{(s)} \to A \ell^+ ν$的跃迁形状因子，其中$A=a_{1}, b_{1}, K_{1}(1270,1400)$，即，在光锥QCD求和规则（LCSR）的框架下，$D^{+} \to a^{0}_{1} (b^{0}_{1}, K^{0}_{1}) \ell^+ ν$，$D^{0} \to a^{-}_{1} (b^{-}_{1}) \ell^+ ν$，和$D^{+}_{s}\to K^{0}_{1} \ell^+ ν$都接近于扭转3分布振幅（DA）。由于这些轴向矢量介子的质量与粲夸克质量相当，我们在计算中排除了包括${m_{A}}/{m_c}$在内的所有项。半轻子$D_{(s)} \to A \ell ν$和非轻子$D\to K_1 (1270,1400) π$衰变的分支比值进行了估计。并将我们的结果与其他方法的预测值和现有的实验值进行了比较。

英文摘要：

In this work, the transition form factors are calculated for the semileptonic $D_{(s)} \to A \ell^+ ν$ where $A=a_{1}, b_{1}, K_{1}(1270,1400)$, i.e., $D^{+} \to a^{0}_{1} (b^{0}_{1}, K^{0}_{1}) \ell^+ ν$, $D^{0} \to a^{-}_{1} (b^{-}_{1}) \ell^+ ν$, and $D^{+}_{s}\to K^{0}_{1} \ell^+ ν$ in the frame work of the light-cone QCD sum rules (LCSR) approach up to the twist-3 distribution amplitudes (DAs). Since the masses of these axial vector mesons are comparable to the charm quark mass, we keep out in our calculations all terms including ${m_{A}}/{m_c}$ in expansion of two--parton DAs. Branching ratio values are estimated for the semileptonic $D_{(s)} \to A \ell ν$ and nonleptonic $D\to K_1 (1270,1400) π$ decays. A comparison is also made between our results and predictions of other methods and the existing experimental values.

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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