arXiv 1302.02272013-02-01hep-ex

半轻子的魅力衰变：迷你评论

Semileptonic Charm Decays: mini review

Chunlei Liu

备注：: Proceedings of CKM 2012, the 7th International Workshop on the CKM Unitarity Triangle, University of Cincinnati, USA, 28 September - 2 October 2012. arXiv admin note: substantial text overlap with arXiv:1207.1171

摘要：

风味物理学领域中的一个重要任务是过度约束CKM矩阵。为了最好地提取CKM矩阵元素，我们需要来自实验数据和理论计算的输入。CKM矩阵的最新知识表明，由于清晰的理论和大量的实验统计数据，我们对sin $2β$的理解是最好的。相反，我们对混合和$|V_{ub}|$的理解都有理论预测的局限性。为了从分支分数测量中提取$|V_{ub}|$的值，我们需要强子形状因子$f_+(q^2)$的信息。我们对$f_+(q^2)$的最好理解来自于格点量子色动力学的计算。为了验证改进的格点量子色动力学计算半轻子B衰变的形状因子，我们可以使用半轻子$D$衰变作为测试和校准。由于CKM矩阵元$|V_{cs(d)}|$可以由么正性精确地得到，我们有了一个可靠的方法来检验格点量子色动力学的计算。$D$半轻子衰变的实验结果可以归纳为两大类：排斥衰变和包容衰变。本文讨论了半轻子$D$衰变的最新测量结果。

英文摘要：

One important task in the field of flavor physics is to over-constrain the CKM matrix. To best extract CKM matrix elements, we need inputs from both experimental data and theoretical calculations. Latest knowledge about the CKM matrix shows our understanding about sin$2β$ is the best thanks to clean theory and large statistics from experiments. In contrast, our understanding of both mixing and $|V_{ub}|$ have limitations from theoretical predictions. In order to extract the value of $|V_{ub}|$ from the branching fraction measurement, we need information on the hadronic form factor $f_+(q^2)$. Our best understanding about $f_+(q^2)$ is from lattice QCD calculations. To validate improved lattice QCD calculations for the form factor in semi-leptonic B decays, we can use semi-leptonic $D$ decays as a test and calibration. Since the CKM matrix elements $|V_{cs(d)}|$ can be obtained precisely from unitarity, we have a reliable method to check the lattice QCD calculations. The experimental results of $D$ semi-leptonic decays can be summarized in two main categories: the exclusive decays and the inclusive decays. Latest measurements from the exclusive semi-leptonic $D$ decays are discussed here.

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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