Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, D.F. 04510, Mexico.
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA.
Phys Rev Lett. 2018 Apr 6;120(14):141802. doi: 10.1103/PhysRevLett.120.141802.
We report the first measurement of monoenergetic muon neutrino charged current interactions. MiniBooNE has isolated 236 MeV muon neutrino events originating from charged kaon decay at rest (K^{+}→μ^{+}ν_{μ}) at the NuMI beamline absorber. These signal ν_{μ}-carbon events are distinguished from primarily pion decay in flight ν_{μ} and ν[over ¯]{μ} backgrounds produced at the target station and decay pipe using their arrival time and reconstructed muon energy. The significance of the signal observation is at the 3.9σ level. The muon kinetic energy, neutrino-nucleus energy transfer (ω=E{ν}-E_{μ}), and total cross section for these events are extracted. This result is the first known-energy, weak-interaction-only probe of the nucleus to yield a measurement of ω using neutrinos, a quantity thus far only accessible through electron scattering.
我们报告了首例单能μ子中微子带电电流相互作用的测量结果。MiniBooNE 实验组在 NuMI 束流线吸收器处，从静止的带电钾介子衰变（K^{+}→μ^{+}ν_{μ}）中，独立出了 236MeVμ子中微子事件。这些信号ν_{μ}-碳事件，通过它们的到达时间和重建的μ子能量，与主要由在靶站和衰变管中产生的飞行中π子衰变ν_{μ}和ν[over ¯]{μ}背景区分开来。信号观测的显著性达到 3.9σ水平。μ子动能、中微子-核能量传递（ω=E{ν}-E_{μ}）以及这些事件的总截面都被提取出来。这一结果是首例已知能量、仅由弱相互作用探测原子核的实验，通过中微子测量ω，这一量值迄今为止只能通过电子散射来获得。
