包涵奇异tau衰变和晶格HVP测定Vus

P. Boyle, R. Hudspith, T. Izubuchi, A. Jüttner, C. Lehner, R. Lewis, K. Maltman, H. Ohki, A. Portelli, M. Spraggs
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引用次数: 6

摘要

我们提出并应用了一种利用奇异强子tau衰变数据和在晶格上计算的强子真空极化函数(HVPs)来确定V us的新方法。实验数据和晶格数据通过色散关系联系起来,色散关系采用一类具有类空间动量极点的权函数。利用RBC/UKQCD合作生成的晶格数据实现这种方法,我们展示了权重函数的例子,该函数强烈抑制来自实验数据具有大不确定性或不存在的区域的光谱积分贡献,同时允许准确确定相关的晶格hvp。我们的结果与K物理和3族CKM统一性的测定结果很好地吻合。本文将讨论新方法相对于传统和规则分析的优点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
|Vus| determination from inclusive strange tau decay and lattice HVP
We propose and apply a novel approach to determining |V us | which uses inclusive strange hadronic tau decay data and hadronic vacuum polarization functions (HVPs) computed on the lattice. The experimental and lattice data are related through dispersion relations which employ a class of weight functions having poles at space-like momentum. Implementing this approach using lattice data generated by the RBC/UKQCD collaboration, we show examples of weight functions which strongly suppress spectral integral contributions from the region where experimental data either have large uncertainties or do not exist while at the same time allowing accurate determinations of relevant lattice HVPs. Our result for |V us | is in good agreement with determinations from K physics and 3-family CKM unitarity. The advantages of the new approach over the conventional sum rule analysis will be discussed.
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