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Tufts University, Medford, Massachusetts 02155, USA.
Illinois Institute of Technology (IIT), Chicago, Illinois 60616, USA.
Phys Rev Lett. 2024 Jan 26;132(4):041801. doi: 10.1103/PhysRevLett.132.041801.
We present the first search for heavy neutral leptons (HNLs) decaying into νe^{+}e^{-} or νπ^{0} final states in a liquid-argon time projection chamber using data collected with the MicroBooNE detector. The data were recorded synchronously with the NuMI neutrino beam from Fermilab's main injector corresponding to a total exposure of 7.01×10^{20} protons on target. We set upper limits at the 90% confidence level on the mixing parameter |U_{μ4}|^{2} in the mass ranges 10≤m_{HNL}≤150 MeV for the νe^{+}e^{-} channel and 150≤m_{HNL}≤245 MeV for the νπ^{0} channel, assuming |U_{e4}|^{2}=|U_{τ4}|^{2}=0. These limits represent the most stringent constraints in the mass range 35<m_{HNL}<175 MeV and the first constraints from a direct search for νπ^{0} decays.
我们利用MicroBooNE探测器收集的数据，首次在液氩时间投影室中寻找衰变为νe⁺e⁻或νπ⁰末态的重中性轻子（HNLs）。这些数据是与费米实验室主注入器产生的NuMI中微子束同步记录的，对应于7.01×10²⁰个靶上质子的总曝光量。我们在90%置信水平下，针对νe⁺e⁻通道在10≤mHNL≤150 MeV质量范围内以及针对νπ⁰通道在150≤mHNL≤245 MeV质量范围内，设定了混合参数|Uμ4|²的上限，假设|Ue4|² = |Uτ4|² = 0。这些限制代表了在35 < mHNL < 175 MeV质量范围内最严格的约束，以及首次通过直接寻找νπ⁰衰变得到的约束。
