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arXiv 2103.00975hep-phhep-exhep-latnucl-exnucl-th
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高精度确定$K_{e3}$辐射修正

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

Chien-Yeah Seng, Daniel Galviz, Mikhail Gorchtein, Ulf-G. Meißner

摘要:

我们报告了一个高精度的计算标准模型电弱辐射校正的$K\to πe^+ν(γ)$衰变的一部分,结合理论的努力,以了解现有的异常测定$V_{us}$。我们的新分析的特点是手征的大红外奇异项的辐射修正和良好的控制下的强相互作用不确定性的基础上,最新的格点量子色动力学输入。在与当前最先进的手征微扰理论结果一致的同时,我们将现有的理论不确定性从$10^{-3}$降低到$10^{-4}$。我们的结果表明,标准模型的电弱效应不能解释的$V_{us}$异常。

英文摘要:

We report a high-precision calculation of the Standard Model electroweak radiative corrections in the $K\to πe^+ν(γ)$ 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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