搜索稀有衰减$π^+ \toμ^+ν_μν\barν$和$π^+ \ to e^+ν_eν\barν$

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搜索稀有衰减$π^+ \toμ^+ν_μν\barν$和$π^+ \ to e^+ν_eν\barν$

Search for the rare decays $π^+ \to μ^+ν_μν\barν$ and $π^+ \to e^+ν_eν\barν$

论文作者

Aguilar-Arevalo, A., Aoki, M., Blecher, M., Britton, D. I., Bruch, D. vom, Bryman, D. A., Chen, S., Comfort, J., Cuen-Rochin, S., Doria, L., Gumplinger, P., Hussein, A., Igarashi, Y., Ito, S., Kettell, S., Kurchaninov, L., Littenberg, L. S., Malbrunot, C., Mischke, R. E., Numao, T., Protopopescu, D., Sher, A., Sullivan, T., Vavilo, D., Gorbunov, D., Kalashnikov, D.

论文摘要

稀有的PION衰减$π^+{\ rightArrow}μ^+ν_μν\barν$和$π^+{\ rightArrow} e^+v+v+v+v+v+v = nc {e}ν\barν$在标准模型中允许使用Pienu实验中的数据搜索了这些衰变。 $γ（π^+{\ rightarrow}μ^+ν_μν\barν\barν）/γ（π^+{\ rightarrow}μ^+ν_μ）<8.6 {\ times} 10^{ - 6} $的第一个结果获得$γ（π^+{\ rightArrow} {e}^+ν_{

The rare pion decays $π^+{\rightarrow}μ^+ν_μν\barν$ and $π^+{\rightarrow}e^+ν_{e}ν\barν$ are allowed in the Standard Model but highly suppressed. These decays were searched for using data from the PIENU experiment. A first result for $Γ(π^+{\rightarrow}μ^+ν_μν\barν)/Γ(π^+{\rightarrow}μ^+ν_μ)<8.6{\times}10^{-6}$, and an improved measurement $Γ(π^+{\rightarrow}{e}^+ν_{e}ν\barν)/Γ(π^+{\rightarrow}μ^+ν_μ)<1.6{\times}10^{-7}$ were obtained.

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