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Lattice QCD Calculation of Electroweak Box Contributions to Superallowed Nuclear and Neutron Beta Decays
Physical Review Letters ( IF 8.6 ) Pub Date : 2024-05-08 , DOI: 10.1103/physrevlett.132.191901 Peng-Xiang Ma 1 , Xu Feng 1, 2, 3 , Mikhail Gorchtein 4, 5 , Lu-Chang Jin 6, 7 , Keh-Fei Liu 8, 9 , Chien-Yeah Seng 10, 11 , Bi-Geng Wang 8, 9 , Zhao-Long Zhang 1
Physical Review Letters ( IF 8.6 ) Pub Date : 2024-05-08 , DOI: 10.1103/physrevlett.132.191901 Peng-Xiang Ma 1 , Xu Feng 1, 2, 3 , Mikhail Gorchtein 4, 5 , Lu-Chang Jin 6, 7 , Keh-Fei Liu 8, 9 , Chien-Yeah Seng 10, 11 , Bi-Geng Wang 8, 9 , Zhao-Long Zhang 1
Affiliation
We present the first lattice QCD calculation of the universal axial -box contribution to both superallowed nuclear and neutron beta decays. This contribution emerges as a significant component within the theoretical uncertainties surrounding the extraction of from superallowed decays. Our calculation is conducted using two domain wall fermion ensembles at the physical pion mass. To construct the nucleon four-point correlation functions, we employ the random sparsening field technique. Furthermore, we incorporate long-distance contributions to the hadronic function using the infinite-volume reconstruction method. Upon performing the continuum extrapolation, we arrive at . Consequently, this yields a slightly higher value of , reducing the previous tension with the CKM unitarity to . Additionally, we calculate the vector -box contribution to the axial charge , denoted as , and explore its potential implications.
中文翻译:
电弱盒对超允许核和中子 Beta 衰变贡献的晶格 QCD 计算
我们提出了万向轴的第一个晶格 QCD 计算盒子贡献超允许的核和中子β衰变。这一贡献成为围绕提取的理论不确定性的一个重要组成部分。来自超级允许的衰变。我们的计算是使用物理π介子质量下的两个畴壁费米子系综进行的。为了构造核子四点相关函数,我们采用随机稀疏场技术。此外,我们使用无限体积重建方法将长距离贡献纳入强子函数。执行连续统外推后,我们得出。因此,这会产生稍高的值,减少之前的与 CKM 统一性的张力。另外,我们计算向量-盒对轴向电荷的贡献,表示为,并探讨其潜在影响。
更新日期:2024-05-09
中文翻译:
电弱盒对超允许核和中子 Beta 衰变贡献的晶格 QCD 计算
我们提出了万向轴的第一个晶格 QCD 计算盒子贡献超允许的核和中子β衰变。这一贡献成为围绕提取的理论不确定性的一个重要组成部分。来自超级允许的衰变。我们的计算是使用物理π介子质量下的两个畴壁费米子系综进行的。为了构造核子四点相关函数,我们采用随机稀疏场技术。此外,我们使用无限体积重建方法将长距离贡献纳入强子函数。执行连续统外推后,我们得出。因此,这会产生稍高的值,减少之前的与 CKM 统一性的张力。另外,我们计算向量-盒对轴向电荷的贡献,表示为,并探讨其潜在影响。