论文标题
中子和Kaon衰变的新计算
New calculations of neutron and kaon decays
论文作者
论文摘要
我们描述了半抑制β衰变中辐射校正理论的两个最新发展。对于中子来说，利用中微子散射数据的$γw$ -box图的新颖分散分析可提高精度，而转移的中心值为$ v_ {ud} $;对于Kaon，介子形式的适当组合，晶格QCD输入和手性扰动理论可以在半抑制的KAON衰减中对辐射校正进行了详尽的改进。这些新计算有助于揭开/锐化/锐化的一系列异常，以$ v_ {ud} $和$ v_ {us} $的测量，这可能指向新物理学的存在。
We describe two recent developments of the radiative correction theory in semileptonic beta decays. For neutron, a novel dispersive analysis of the $γW$-box diagram making use of neutrino scattering data leads to an improved precision and a shifted central value of $V_{ud}$; for kaon, an appropriate combination of meson form factors, lattice QCD inputs and chiral perturbation theory gives a much-improved determination of the radiative corrections in semileptonic kaon decays. These new calculations help to unveil/sharpen a series of anomalies in the measurements of $V_{ud}$ and $V_{us}$ that may point towards the existence of new physics.
