中微子振荡谱函数模型中CCQE不确定性的参数化
Parametrising CCQE uncertainties in the Spectral Function model for neutrino oscillation analyses
摘要：
在中微子振荡实验中，很大一部分系统的不确定性来自于在描述中微子-原子核相互作用时对原子核建模的不精确性。谱函数（SF）模型的特点是在壳模型图像中核子内部动量和去除能的分布，并且还考虑了核子之间的短程相关。这些特性提供了相对于更常用的基于费米气体的模型的显著改进。电子散射实验提供了一个精确的探针的核的结构，并已被用来构建和验证SF模型。因此，SF是长基线中微子实验的一个有趣的参考模型。基于电子散射数据的约束，我们开发了一组参数，可以改变核壳层的占有率和每个壳层内核子动量的分布。此外，末态相互作用对出射轻子和核子运动学的影响、短程关联的贡献和泡利阻塞效应也可以修正。在本文中，我们将首先描述这些参数的发展，部分基于与电子散射数据的比较。然后，我们显示适合这些参数可用的T2 K和MINER $ν$ A截面数据，并讨论它们如何可以用来约束系统的不确定性相关的SF模型在中微子振荡分析。
英文摘要：
A substantial fraction of systematic uncertainties in neutrino oscillation experiments stems from the lack of precision in modeling the nucleus when describing the neutrino-nucleus interactions. The Spectral Function (SF) model features a distribution of momenta and removal energies of nucleons inside the nucleus within the shell-model picture, and also accounts for short-range correlations between nucleons. These characteristics offer significant improvements with respect to the more commonly used Fermi gas-based models. Electron scattering experiments offer a precise probe of the structure of the nucleus and have been used to both construct and validate the SF model. SF is thus an interesting reference model for long baseline neutrino experiments. Based on constraints from electron scattering data, we develop a set of parameters that can alter the occupancy of the nuclear shells and the distribution of the nucleon momentum within each shell. In addition, the impact of final-state interactions on the outgoing lepton and nucleon kinematics, the contribution of short-range correlations and the effect of Pauli blocking can also be modified. In this document, we will first describe the development of these parameters, partially based on a comparison with electron scattering data. We then show fits of these parameters to available T2K and MINER$ν$A cross-section data and discuss how they can be used to constrain the systematic uncertainties related to the SF model in neutrino oscillation analyses.
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