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Tufts University, Medford, Massachusetts 02155, USA.
Kansas State University (KSU), Manhattan, Kansas 66506, USA.
Phys Rev Lett. 2020 Nov 13;125(20):201803. doi: 10.1103/PhysRevLett.125.201803.
We report on the first measurement of flux-integrated single differential cross sections for charged-current (CC) muon neutrino (ν_{μ}) scattering on argon with a muon and a proton in the final state, ^{40}Ar (ν_{μ},μp)X. The measurement was carried out using the Booster Neutrino Beam at Fermi National Accelerator Laboratory and the MicroBooNE liquid argon time projection chamber detector with an exposure of 4.59×10^{19} protons on target. Events are selected to enhance the contribution of CC quasielastic (CCQE) interactions. The data are reported in terms of a total cross section as well as single differential cross sections in final state muon and proton kinematics. We measure the integrated per-nucleus CCQE-like cross section (i.e., for interactions leading to a muon, one proton, and no pions above detection threshold) of (4.93±0.76_{stat}±1.29_{sys})×10^{-38} cm^{2}, in good agreement with theoretical calculations. The single differential cross sections are also in overall good agreement with theoretical predictions, except at very forward muon scattering angles that correspond to low-momentum-transfer events.
我们报告了对末态有一个μ子和一个质子的带电流（CC）μ子中微子（νμ）与氩核散射，即40Ar（νμ，μp）X的通量积分单微分截面的首次测量。该测量使用了费米国家加速器实验室的助推中微子束以及MicroBooNE液态氩时间投影室探测器，靶上质子曝光量为4.59×10^19 。选择事例以增强CC类弹性（CCQE）相互作用的贡献。数据以总截面以及末态μ子和质子运动学的单微分截面形式给出。我们测量的每核CCQE类积分截面（即对于导致一个μ子、一个质子且无高于探测阈值的π介子的相互作用）为（4.93±0.76统计±1.29系统）×10^-38 cm^2，与理论计算结果吻合良好。单微分截面总体上也与理论预测相符，但在对应于低动量转移事例的非常前向的μ子散射角处除外。
