论文标题
绑定在第一个四周科学运行中的3+1个主动性中微子混合
Bound on 3+1 active-sterile neutrino mixing from the first four-week science run of KATRIN
论文作者
论文摘要
我们报告了2019年〜2019年Katrin实验的第一个为期四周科学运行的轻型无菌中微子搜索。通过高分辨率的MAC-E过滤器分析了来自高纯度气态分子tri源的β-末日电子，低于18.57 KeV的端点下方40 eV。我们考虑使用三个主动中微子和一个质量$ m_ {4} $的无菌中微子的框架。该分析对第四质量状态$ M^2_ {4} \ Lessim $ 1000 EV $^2 $和Active-to-Sterile中微子混合到$ | u_ {e4} |^2 \ gtrsim 2 \ cdot10^{ - 2} $。未观察到明显的光谱失真，并报告了无菌质量的排除界限和混合。这些新限制取代了Mainz的结果，并改善了$ M^2_ {4} <$ 30 ev $^2 $的TROITSK。反应堆和镀凝剂异常以$ 100 <δ{m}^2_ {41} <1000 $ ev $^2 $的限制。
We report on the light sterile neutrino search from the first four-week science run of the KATRIN experiment in~2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are analyzed by a high-resolution MAC-E filter down to 40 eV below the endpoint at 18.57 keV. We consider the framework with three active neutrinos and one sterile neutrino of mass $m_{4}$. The analysis is sensitive to a fourth mass state $m^2_{4} \lesssim$ 1000 eV$^2$ and to active-to-sterile neutrino mixing down to $|U_{e4}|^2 \gtrsim 2\cdot10^{-2}$. No significant spectral distortion is observed and exclusion bounds on the sterile mass and mixing are reported. These new limits supersede the Mainz results and improve the Troitsk bound for $m^2_{4} <$ 30 eV$^2$. The reactor and gallium anomalies are constrained for $ 100 < Δ{m}^2_{41} < 1000$ eV$^2$.
