论文标题
标准模型估计$ k^+\toπ^+4e $分支比率
Standard Model estimate of $K^+\toπ^+4e$ branching ratio
论文作者
论文摘要
$ k^+\toπ^+e^+e^-e^+e^ - $（$ k^+\toπ^+4e $）的分支比率是在标准模型中以领先顺序计算的。中性杆极的优势确定总体分支比为$ b（k^+\toπ^+4e）= b（k^+\toπ^+π^0）b（π^0 \ to4e）\ oft7.0（3）\ times10^{ - 6} $。这种贡献的重要性非常集中在整个可用相位空间的背景下，在大多数范围内，单次交换拓扑又依然普遍存在。因此，仅在允许运动区域的一部分中表现出分支比率很有趣。我们发现，例如，$ b（k^+\toπ^+4e，\，m_ {4e}> 150 \，\ text {mev}）= 6.0（6）\ times10^{ - 11} $。
The branching ratio of the $K^+\toπ^+e^+e^-e^+e^-$ ($K^+\toπ^+4e$) decay is calculated at leading order in the Standard Model. The dominance of the neutral-pion pole determines the overall branching ratio to be $B(K^+\toπ^+4e)=B(K^+\toπ^+π^0)B(π^0\to4e)\approx7.0(3)\times10^{-6}$. The significance of this contribution is very much concentrated in the context of the whole available phase space, throughout most of which the one-photon-exchange topology is prevalent in turn. It is thus interesting to present branching ratios for only parts of the allowed kinematical region. We find, for instance, $B(K^+\toπ^+4e,\,m_{4e}>150\,\text{MeV})=6.0(6)\times10^{-11}$.
