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arXiv 1209.0085hep-ex
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$D^+$和$D^+_s$介子轻子衰变研究结果的回顾与报告

Review and Report on Results of Leptonic Decays of $D^+$ and $D^+_s$ Mesons

Gang Rong

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To appear in the proceedings of The 5th International Workshop on Charm Physics (Charm 2012)
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摘要：

在过去的25年里，人们进行了许多$e^+e^-$实验和固定靶实验来寻找和研究$D^+$和$D^+_s$介子的轻子衰变。到2012年，在这些实验中已经积累了超过530个$D^+$轻子衰变的信号事件和大约$4\times10^3$ $D^+_s$轻子衰变的信号事件。利用这些轻子衰变信号事件，分别以2.4%和1.6%的精度测量了衰变常数$f_{D^+}$和$f_{D_s^+}$，这可以用于更精确地测试衰变常数的LQCD计算。将这些精确测量的$f_{D^+}$和$f_{D_s^+}$与基于QCD的理论预测的结果进行比较，提供了一些关于标准模型之外的新物理学的信息。除此之外，通过测量$D^+\rightarrow l^+ν$和$D_s^+\rightarrow l^+ν$衰变的分支分数，可以确定CKM矩阵元素$|V_{\rm cd}|$和$|V_{\rm cs}|$。将这些$|V_{\rm cd}|$和$|V_{\rm cs}|$与从CKMfitter中确定的或从$D$介子半轻子衰变中提取的结果进行比较，也可以提供一些关于新物理学的信息。本文回顾和报道了在不同实验条件下测量的$D^+$和$D^+_s$介子轻子衰变的结果。对于已经发表的结果，我们在较短的摘要中回顾这些结果，而对于尚未发表或尚未报告的结果，我们将在报告之前进行更详细的讨论。

英文摘要：

In the last 25 years, many $e^+e^-$ experiments and fixed-target experiments performed to search for and study the leptonic decays of the $D^+$ and $D^+_s$ mesons. By 2012, more than 530 signal events of the $D^+$ leptonic decays and about $4\times10^3$ signal events of the $D^+_s$ leptonic decays have been accumulated at these experiments. With these leptonic decay signal events, both decay constants $f_{D^+}$ and $f_{D_s^+}$ are, respectively, measured at an accuracy level of 2.4% and 1.6%, which can be used to more precisely test the LQCD calculations of the decay constants. Comparing these precisely measured $f_{D^+}$ and $f_{D_s^+}$ with those predicted with theories based on QCD provides some information about New Physics beyond the Standard Model. In addition to these, with the measured branching fractions for $D^+\rightarrow l^+ν$ and $D_s^+\rightarrow l^+ν$ decays, the CKM matrix elements $|V_{\rm cd}|$ and $|V_{\rm cs}|$ can be determined. Comparing these $|V_{\rm cd}|$ and $|V_{\rm cs}|$ to those determined from the CKMfitter or extracted from $D$ meson semileptonic decays can also provide some information about the New Physics. In this article, we review and report the results on the leptonic decays of $D^+$ and $D^+_s$ mesons measured at different experiments. For the results which have already been published, we review these in shorter summaries, while for the results which have not been published or have not been reported yet before we report these with more detailed discussion.

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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