Standard model O(α) renormalization of gA and its impact on new physics searches
Standard model O(α) renormalization of gA and its impact on new physics searches
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gA 的标准模型 O(α) 重整化及其对新物理搜索的影响
DOI：
10.1103/physrevd.103.113001
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发表时间：
2021
影响因子：
5
通讯作者：
Hayen, Leendert
中科院分区：
文献类型：
--
作者：
Hayen, Leendert
我们给出了Gamow-Teller衰变内辐射修正的标准模型计算。我们发现一种主要的贡献来自于光子顶点修正和盒图。经过计算，大多数弹性贡献由于等标量和等矢量光子贡献之间的交叉对称或抵消而消失，只剩下极化的奇宇称贡献，即著名的费米衰变的轴盒贡献的Gamow-Teller等价。我们证明了弱磁性对玻恩振幅的贡献很大，并利用实验数据约束的极化Bjorken和规则的全纯延拓，在低能量下考虑了附加的强子贡献。我们通过运行Bjorken和Gross-Llewell yn Smith求和规则，对费米内辐射校正执行了相同的过程。我们讨论了重味道、高扭度和目标质量修正，发现后者在低动量时显著增加。我们分别找到了轴向和矢量内辐射修正，结果是，这使我们能够第一次提取我们所知道的。我们讨论了在Beyond Standard Model Fits中将实验数据与晶格计算进行比较的结果。此外，我们展示了一些传统的衰变计算如何包含这种影响的一部分，但不能在全部结果中考虑取消。最后，我们对Cabibbo-Kobayashi-Maskawa矩阵元的升降矩阵元的同位旋镜衰变提取中的重复计数实例进行了修正，解决了长期存在的紧张问题，并提高了精度。
We present anStandard Model calculation of the inner radiative corrections to Gamow-Tellerdecays. We find thata prioricontributions arise from the photonic vertex correction andbox diagram. Upon evaluation most elastic contributions vanish due to crossing symmetry or cancellation between isoscalar and isovector photonic contributions, leaving only the polarized parity-odd contribution, i.e., the Gamow-Teller equivalent of the well-known axialbox contribution for Fermi decays. We show that weak magnetism contributes significantly to the Born amplitude, and consider additional hadronic contributions at low energy using a holomorphic continuation of the polarized Bjorken sum rule constrained by experimental data. We perform the same procedure for the Fermi inner radiative correction through a combination of the running of Bjorken and Gross-Llewellyn Smith sum rules. We discuss heavy flavor, higher-twist, and target mass corrections and find a significant increase at low momentum from the latter. We findandfor axial and vector inner radiative corrections, respectively, resulting in, which allows us to extractfor the first time to our knowledge. We discuss consequences for comparing experimental data to lattice calculations in beyond Standard Model fits. Further, we show how some traditionaldecay calculations contain part of this effect but fail to account for cancellations in the fullresult. Finally, we correct for a double-counting instance in the isospinmirror decay extraction of, the up-down matrix element of the Cabibbo-Kobayashi-Maskawa matrix element, resolving a long-standing tension and leading to increased precision.