计算介子半轻子β衰变电磁效应的新方法
New method for calculating electromagnetic effects in semileptonic beta-decays of mesons
摘要：
我们构造了几类强子矩阵元，并将它们与描述π介子和K介子半轻子β衰变电磁效应的手征微扰理论中的低能常数联系起来。我们建议使用格点量子色动力学计算它们，并认为这样的计算将立即影响到一些有趣的话题在精度前沿，包括突出的异常$|V_{us}|$和顶行Cabibbo-Kobayashi-Maskawa矩阵酉性。
英文摘要：
We construct several classes of hadronic matrix elements and relate them to the low-energy constants in Chiral Perturbation Theory that describe the electromagnetic effects in the semileptonic beta decay of the pion and the kaon. We propose to calculate them using lattice QCD, and argue that such a calculation will make an immediate impact to a number of interesting topics at the precision frontier, including the outstanding anomalies in $|V_{us}|$ and the top-row Cabibbo-Kobayashi-Maskawa matrix unitarity.
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