标题： 高精度确定$K_{e3}$辐射修正 显示英文标题

标题： High-precision determination of the $K_{e3}$ radiative corrections

摘要： 我们报告了在 $K\to \pi e^+\nu(\gamma)$ 衰变中标准模型电弱辐射修正的高精度计算，这是理解 $V_{us}$ 确定中现有异常的综合理论努力的一部分。 我们的新分析特征在于对辐射修正中大红外奇异项的手征重求和，以及基于最新格点QCD输入的良好控制的强相互作用不确定性。 尽管与当前从手征微扰论获得的最先进结果一致，我们已经将现有的理论不确定性从 $10^{-3}$ 减少到 $10^{-4}$。 我们的结果表明，标准模型电弱效应无法解释 $V_{us}$ 的异常。 显示英文摘要

摘要： We report a high-precision calculation of the Standard Model electroweak radiative corrections in the $K\to \pi e^+\nu(\gamma)$ decay as a part of the combined theory effort to understand the existing anomaly in the determinations of $V_{us}$. Our new analysis features a chiral resummation of the large infrared-singular terms in the radiative corrections and a well-under-control strong interaction uncertainty based on the most recent lattice QCD inputs. While being consistent with the current state-of-the-art results obtained from chiral perturbation theory, we reduce the existing theory uncertainty from $10^{-3}$ to $10^{-4}$. Our result suggests that the Standard Model electroweak effects cannot account for the $V_{us}$ anomaly.