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arXiv 1504.01692hep-lathep-ph
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具有物理轻夸克质量的Nf=2+1畴壁格点量子色动力学中的K介子半轻子形状因子

The kaon semileptonic form factor in Nf=2+1 domain wall lattice QCD with physical light quark masses

Peter A. Boyle, Norman H. Christ, Jonathan M. Flynn, Nicolas Garron, Chulwoo Jung, Andreas Juttner, Robert D. Mawhinney, David Murphy, Christopher T. Sachrajda,… 展开作者

Peter A. Boyle, Norman H. Christ, Jonathan M. Flynn, Nicolas Garron, Chulwoo Jung, Andreas Juttner, Robert D. Mawhinney, David Murphy, Christopher T. Sachrajda, Francesco Sanfilippo, Hantao Yin

摘要:

在2+1味畴壁格点量子色动力学连续极限下,首次计算了海夸克和价夸克质量调谐到物理值时K介子半轻子形状因子。我们分析了一套全面的模拟在现象学上方便点的零动量转移在大的物理量和两个不同的值的晶格间距。我们对形状因子的预测是f+(0)=0.9685(34)(14),其中第一个误差是统计误差,第二个误差是系统误差。这个结果可以与K-> π衰变的实验测量相结合,用于确定CKM矩阵元素,我们预测|Vus| =0.2233(5)(9),其中第一个误差来自实验,第二个误差来自晶格计算。

英文摘要:

We present the first calculation of the kaon semileptonic form factor with sea and valence quark masses tuned to their physical values in the continuum limit of 2+1 flavour domain wall lattice QCD. We analyse a comprehensive set of simulations at the phenomenologically convenient point of zero momentum transfer in large physical volumes and for two different values of the lattice spacing. Our prediction for the form factor is f+(0)=0.9685(34)(14) where the first error is statistical and the second error systematic. This result can be combined with experimental measurements of K->pi decays for a determination of the CKM-matrix element for which we predict |Vus|=0.2233(5)(9) where the first error is from experiment and the second error from the lattice computation.

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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