Reduced Hadronic Uncertainty in the Determination of V-ud
Reduced Hadronic Uncertainty in the Determination of V-ud
复制标题
降低 V-ud 测定中的强子不确定性
DOI：
10.1103/physrevlett.121.241804
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发表时间：
2018
影响因子：
8.6
通讯作者：
Ramsey-Musolf Michael J.
中科院分区：
文献类型：
--
作者：
Seng Chien-Yeah;Gorchtein Mikhail;Patel Hiren H.;Ramsey-Musolf Michael J.
我们分析了普遍的辐射修正中子和超允许核衰变的色散关系，我们确定为一个积分的第一个纳克曼时刻的干涉结构函数的强子盒的贡献表示。通过连接所需的输入到现有的中微子和反中微子散射的数据，我们得到一个更新的值，其中强子的不确定性减少。假设其他标准模型的理论计算和实验测量保持不变，我们得到一个更新的值，提高紧张与第一行Cabibbo-Kobayashi-Maskawa么正性约束。我们评论的方式，目前和未来的实验可以为我们的分散分析提供输入。
We analyze the universal radiative correctionto neutron and superallowed nucleardecay by expressing the hadronic-box contribution in terms of a dispersion relation, which we identify as an integral over the first Nachtmann moment of theinterference structure function. By connecting the needed input to existing data on neutrino and antineutrino scattering, we obtain an updated value of, wherein the hadronic uncertainty is reduced. Assuming other standard model theoretical calculations and experimental measurements remain unchanged, we obtain an updated value of, raising tension with the first row Cabibbo-Kobayashi-Maskawa unitarity constraint. We comment on ways current and future experiments can provide input to our dispersive analysis.