Hammer事件、中微子能量和核子-核子关联
Hammer events, neutrino energies, and nucleon-nucleon correlations
摘要：
中微子振荡的测量取决于在不同中微子能量或离源不同距离处中微子-核相互作用速率之间的差异。中微子能谱和中微子-探测器相互作用的知识对这些实验至关重要。核内核子-核子短程关联（SRC）影响核的性质。ArgoNeut液体氩时间投影室（lArTPC）观察到了中微子-氩散射事件，其中两个质子连续处于最终状态（“锤子”事件），他们将其与SRC对联系起来。MicroBoone lArTPC将测量更多的此类事件。我们用两个简单的模型来模拟锤击事件。我们使用众所周知的电子-核子截面来计算电子-氩相互作用，其中电子从质子散射，喷射出π +，然后π +被吸收在移动的类氘$np$对上。我们还使用了一个模型，其中电子激发一个核子的德尔塔，然后通过与第二个核子相互作用去激发。π介子产生模型产生的两个质子与锤子事件非常相似。这些分布对吸收$π$的$np$对的动量不敏感。入射的中微子能量可以仅仅从出射的轻子中重建出来。德尔塔过程导致两个质子与观察到的事件不太相似。ArgoNeut锤事件可以用一个简单的π介子产生和再吸收模型来描述。MicroBooNE中的这些锤击事件可以用来确定入射中微子能量，但不能用来了解SRC。我们认为，该反应通道可用于中微子振荡实验，以补充其他通道具有更高的统计，但不同的系统不确定性。
英文摘要：
Neutrino oscillation measurements depend on a difference between the rate of neutrino-nucleus interactions at different neutrino energies or different distances from the source. Knowledge of the neutrino energy spectrum and neutrino-detector interactions are crucial for these experiments. Short range nucleon-nucleon correlations in nuclei (SRC) affect properties of nuclei. The ArgoNeut liquid Argon Time Projection Chamber (lArTPC) observed neutrino-argon scattering events with two protons back-to-back in the final state ("hammer" events) which they associated with SRC pairs. The MicroBoone lArTPC will measure far more of these events. We simulate hammer events using two simple models. We use the well-known electron-nucleon cross section to calculate e-argon interactions where the e- scatters from a proton, ejecting a pi+, and the pi+ is then absorbed on a moving deuteron-like $np$ pair. We also use a model where the electron excites a nucleon to a Delta, which then deexcites by interacting with a second nucleon. The pion production model results in two protons very similar to those of the hammer events. These distributions are insensitive to the momentum of the $np$ pair that absorbed the $π$. The incident neutrino energy can be reconstructed from just the outgoing lepton. The Delta process results in two protons that are less similar to the observed events. ArgoNeut hammer events can be described by a simple pion production and reabsorption model. These hammer events in MicroBooNE can be used to determine the incident neutrino energy but not to learn about SRC. We suggest that this reaction channel could be used for neutrino oscillation experiments to complement other channels with higher statistics but different systematic uncertainties.
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