Novel |V_{us}| Determination Using Inclusive Strange t Decay and Lattice Hadronic Vacuum Polarization Functions.
Novel |V_{us}| Determination Using Inclusive Strange t Decay and Lattice Hadronic Vacuum Polarization Functions.
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小说 |V_{us}|
DOI：
10.1103/physrevlett.121.202003
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发表时间：
2018
影响因子：
8.6
通讯作者：
Boyle P
中科院分区：
文献类型：
--
作者：
Boyle P
我们提出并应用了一种新的方法，利用具有欧几里得（类空间）动量极点的权函数来确定色散关系，这种色散关系将奇异强子衰变分布与从晶格量子色动力学得到的强子真空极化（HVP）函数联系起来。我们展示了一些例子，其中来自实验数据有很大误差或不存在的区域的光谱积分贡献被强烈抑制，但相关晶格HVP组合的准确测定仍然是可能的。该结果与物理学和三族Cabibbo-Kobayashi-Maskawa统一的测定结果一致。本文还讨论了这种新方法相对于传统的用破味求和规则测定强子衰变的优点。
We propose and apply a new approach to determiningusing dispersion relations with weight functions having poles at Euclidean (spacelike) momentum which relate strange hadronicdecay distributions to hadronic vacuum polarization (HVP) functions obtained from lattice quantum chromodynamics. We show examples where spectral integral contributions from the region where experimental data have large errors or do not exist are strongly suppressed but accurate determinations of the relevant lattice HVP combinations remain possible. The resultingagrees well with determinations fromphysics and three-family Cabibbo-Kobayashi-Maskawa unitarity. Advantages of this new approach over the conventional hadronicdecay determination employing flavor-breaking sum rules are also discussed.