标题： 轻夸克环在$K^\pm \to π^\pm ν\barν$中来自矢量介子主导和K介子单位三角形的更新 显示英文标题

标题： Light quark loops in $K^\pm \to π^\pm ν\barν$ from vector meson dominance and update on the Kaon Unitarity Triangle

摘要： 我们使用矢量介子主导理论来计算来自涉及上夸克环的矩阵元的稀有衰变$K^\pm \to \pi^\pm \nu\bar \nu$的分支比的非微扰贡献。 然后在仅基于K介子扇区观测值的单位三角形研究背景下，讨论了该可观测量以及$K^0 \to \pi^0 l^+ l^-$和直接CP破坏参数$\epsilon_K^{\prime}$的重要性。 显示英文摘要

摘要： We use vector meson dominance to calculate non-perturbative contributions to the branching ratio of the rare decay $K^\pm \to \pi^\pm \nu\bar \nu$ stemming from matrix elements involving up-quark loops. The importance of this observable as well as of $K^0 \to \pi^0 l^+ l^-$ and of the direct CP violation parameter $\epsilon_K^{\prime}$ is then discussed in the context of a Unitarity Triangle sqtudy based on Kaon sector observables only.