论文标题
不合格的蜡烛：低gev中微子能量的低$ν$方法
A substandard candle: the low-$ν$ method at few-GeV neutrino energies
论文作者
论文摘要
随着加速剂 - 中性振荡实验改善了振荡参数的约束，对进入中微子通量和相互作用模型对系统不确定性的控制越来越重要。现代实验提供的强烈光束允许使用原位“标准蜡烛”测量来限制多种选择。这些标准蜡烛必须使用非常了解的过程，以避免引入偏见。在这种情况下讨论的一种选项是“低$ν$”方法，旨在分离中微子相互作用，而在核向低能转移的情况下，预计横截面将随着中微子能量的函数而大致稳定。然后可以使用低能传递事件样品的形状来提取通量形状。该方法在高中微子能量（许多GEV）上的应用已得到充分了解。但是，由于存在核和形式因子效应，该方法在当前和未来的促进剂中微子实验的几个GEV能量上的适用性尚不清楚。 在此分析中，我们使用（抗）中微子相互作用（抗）中微子相互作用在Argon和heTie，Neut，Nuwro和Gibuu事件生成器中使用（抗）中微子相互作用，以实验非依赖性的方式使用低$ν$方法来改善对加速器中微子通量的限制的前景。结果表明，低$ν$方法的通量约束将严重取决于用于中微子能量小于5 GEV的分析中使用的特定相互作用模型假设。模型预测的传播表明，低$ν$分析不太可能为典型的中微子通量不确定性提供太大改善，即使具有完美的检测器。值得注意的是 - 与低$ν$方法固有的假设相反 - 模型依赖性随着少数GEV区域的实验的能量传递而增加。
As accelerator-neutrino oscillation experiments improve oscillation parameter constraints, control over systematic uncertainties on the incoming neutrino flux and interaction models is increasingly important. The intense beams offered by modern experiments permit a variety of options to constrain the flux using in situ "standard candle" measurements. These standard candles must use very well understood processes to avoid introducing bias. One option discussed in this context is the "low-$ν$" method, designed to isolate neutrino interactions where there is low energy-transfer to the nucleus, such that the cross section is expected to be approximately constant as a function of neutrino energy. The shape of the low-energy transfer event sample can then be used to extract the flux shape. Applications of the method at high neutrino energies (many tens of GeV) are well understood. However, the applicability of the method at the few-GeV energies of current and future accelerator neutrino experiments remains unclear due to the presence of nuclear and form-factor effects. In this analysis we examine the prospects for improving constraints on accelerator neutrino fluxes with the low-$ν$ method in an experiment-independent way, using (anti)neutrino interactions on argon and hydrocarbon targets from the GENIE, NEUT, NuWro and GiBUU event generators. The results show that flux constraints from the low-$ν$ method would be severely dependent on the specific interaction model assumptions used in an analysis for neutrino energies less than 5 GeV. The spread of model predictions show that a low-$ν$ analysis is unlikely to offer much improvement on typical neutrino flux uncertainties, even with a perfect detector. Notably -- running counter to the assumption inherent to the low-$ν$ method -- the model-dependence increases with decreasing energy transfer for experiments in the few-GeV region.
