D和Ds衰变常数的精确格点计算
Precision Lattice Calculation of D and Ds decay constants
摘要：
本文用格点量子色动力学计算了$D$和$D_s$介子的衰变常数，总误差约为2%，比以前的计算结果好了近三倍。我们已经能够实现这一点，通过使用一个高度改进的离散化的QCD的魅力夸克，再加上规范配置所产生的MILC合作，包括海u，d和s夸克的全部效果。我们的结果的范围内的u/d质量下降到m_s/5和三个值的晶格间距，这使我们能够执行准确的连续和手征外推。我们固定魅夸克质量以给出η_c质量的实验值，然后对我们方法的严格检验是我们获得了D和D_s介子质量的正确（且准确）值。将f_D、f_{D_s}与f_K、f_π进行了比较，并通过实验确定了相应的CKM元素，精度较高。
英文摘要：
We present a determination of the decay constants of the $D$ and $D_s$ mesons from lattice QCD, each with a total error of about 2%, approximately a factor of three better than previous calculations. We have been able to achieve this through the use of a highly improved discretization of QCD for charm quarks, coupled to gauge configurations generated by the MILC collaboration that include the full effect of sea u, d, and s quarks. We have results for a range of u/d masses down to m_s/5 and three values of the lattice spacing, which allow us to perform accurate continuum and chiral extrapolations. We fix the charm quark mass to give the experimental value of the η_c mass, and then a stringent test of our approach is the fact that we obtain correct (and accurate) values for the mass of the D and D_s mesons. We compare f_D and f_{D_s} with f_K and f_π, and using experiment determine corresponding CKM elements with good precision.
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