论文标题
在$ k^{+} $衰减中搜索Lepton风味和Lepton数字违反了Na62
Searches for lepton flavour and lepton number violation in $K^{+}$ decays at NA62
论文作者
论文摘要
A search for the lepton number violating $K^{+}\rightarrowπ^{-}μ^{+}e^{+}$ and lepton flavour violating $K^{+}\rightarrowπ^{+}μ^{-}e^{+}$ decays is reported using NA62 data collected in 2017 and 2018. No significant excess is observed above the background expectation因此，在分支比率上以$ 90 \％$置信度的水平建立上限：$ \ Mathcal {b}（k^{+} \rightarrowπ^{ - }μ^{+} e^{+} e^{+} $ \ Mathcal {b}（k^{+} \rightArrowπ^{+}μ^{ - } e^{+}）<6.6 \ times10^{ - 11} $。这些结果分别由$ 12 $和$ 8 $的因素改善。
A search for the lepton number violating $K^{+}\rightarrowπ^{-}μ^{+}e^{+}$ and lepton flavour violating $K^{+}\rightarrowπ^{+}μ^{-}e^{+}$ decays is reported using NA62 data collected in 2017 and 2018. No significant excess is observed above the background expectation and therefore upper limits are established on the branching ratios at $90\%$ confidence level: $\mathcal{B}(K^{+}\rightarrowπ^{-}μ^{+}e^{+})<4.2\times10^{-11}$ and $\mathcal{B}(K^{+}\rightarrowπ^{+}μ^{-}e^{+})<6.6\times10^{-11}$. These results improve over the previous limits by factors of $12$ and $8$ respectively.
