发表机构
Institute of Theoretical Physics, Chinese Academy of Sciences; University of Chinese Academy of Sciences, School of Physical Sciences; School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, UCAS; International Centre for Theoretical Physics Asia-Pacific（中国科学院理论物理研究所; 中国科学院大学物理科学学院; 杭州高等研究院基础物理与数学学院; 亚太理论物理中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究将Δ(1232)共振纳入相关QED辐射修正，明确其对轴矢量荷的幂次计数与IBD辐射修正的影响，为核子荷及IBD的理论计算提供了关键修正。
AI 中文摘要
我们将Δ(1232)共振纳入由π介子引发的中子衰变和逆β衰变（IBD）的QED辐射修正中。在包含显式Δ自由度的重子手征微扰论框架内，我们计算了额外贡献并研究了其对IBD截面及核子同位旋矢量矢量荷、轴矢量荷重整化的影响。Δ共振不会重整化矢量荷；对于轴矢量荷，纳入Δ共振可恢复幂次计数，并显著降低实验与格点QCD比值g_A/(g^QCD_A g_V)的QED辐射修正，使其在辐射修正不确定度范围内趋于零。Δ共振使π介子引发的IBD QED辐射修正提升1.2至1.3倍。
英文摘要
We incorporate the $Δ(1232)$ resonance into pion-induced QED radiative corrections to neutron decay and inverse beta decay (IBD). Within the framework of heavy-baryon chiral perturbation theory with explicit $Δ$ degrees of freedom, we compute additional contributions and study their impact on IBD cross sections and on the renormalization of the nucleon isovector vector and axial-vector charges. $Δ$ resonance does not renormalize the vector charge. For the axial-vector charge, including the $Δ$ resonance improves convergence and reduces the QED radiative correction to the experiment-over-lattice-QCD ratio $g_A/\left(g^\mathrm{QCD}_A g_V\right)$. $Δ$ resonance increases the pion-induced QED radiative corrections to IBD by a factor $1.2$-$1.3$.
Comments19 pages, 1 figure, expressions and results corrected
