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arXiv 1603.03048hep-phhep-exnucl-exnucl-th
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精确中微子-核截面的氘靶数据

Deuterium target data for precision neutrino-nucleus cross sections

Aaron S. Meyer, Minerba Betancourt, Richard Gran, Richard J. Hill

备注：
17 pages, 9 figures. v2: Supplementary data included, minor typos corrected. v3: replaced with published version
发表信息：
Phys. Rev. D 93, 113015 (2016)
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摘要：

由基本目标散射数据导出的振幅是中微子-核截面预测的基本输入。一个突出的例子是等矢量轴向核子形状因子，$F_A(q^2)$，它控制着基于加速器的中微子振荡实验中的带电电流信号过程。以前的提取$F_A$从中微子-氘散射数据依赖于偶极子形状的假设，引入了一个不可量化的错误。利用一个独立于模型的、可系统改进的$F_A$表示法对中微子-氘散射的世界数据进行了新的分析。一个完整的误差预算的核子等矢量轴半径导致$r_A^2=0.46(22) \,{\rm fm}^2$，具有更大的不确定性比原来的分析中确定的。准弹性中微子-中子截面被确定为$σ(ν_μn \to μ^- p)\big|_{E_ν=1\,{\rm GeV}} = 10.1(0.9) \times 10^{-39}{\rm cm}^2$。利用MINERvA数据和GENIE事件发生器说明了核子级约束和不确定性对核截面的传播。这些技术可以很容易地扩展到其他幅度和过程。

英文摘要：

Amplitudes derived from scattering data on elementary targets are basic inputs to neutrino-nucleus cross section predictions. A prominent example is the isovector axial nucleon form factor, $F_A(q^2)$, which controls charged current signal processes at accelerator-based neutrino oscillation experiments. Previous extractions of $F_A$ from neutrino-deuteron scattering data rely on a dipole shape assumption that introduces an unquantified error. A new analysis of world data for neutrino-deuteron scattering is performed using a model-independent, and systematically improvable, representation of $F_A$. A complete error budget for the nucleon isovector axial radius leads to $r_A^2=0.46(22) \,{\rm fm}^2$, with a much larger uncertainty than determined in the original analyses. The quasielastic neutrino-neutron cross section is determined as $σ(ν_μn \to μ^- p)\big|_{E_ν=1\,{\rm GeV}} = 10.1(0.9) \times 10^{-39}{\rm cm}^2$. The propagation of nucleon-level constraints and uncertainties to nuclear cross sections is illustrated using MINERvA data and the GENIE event generator. These techniques can be readily extended to other amplitudes and processes.

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