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arXiv 1610.01464nucl-thhep-exhep-ph
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中微子振荡实验中中微子-核反应的统一模型

Towards a Unified Model of Neutrino-Nucleus Reactions for Neutrino Oscillation Experiments

S. X. Nakamura, H. Kamano, Y. Hayato, M. Hirai, W. Horiuchi, S. Kumano, T. Murata, K. Saito, M. Sakuda, T. Sato, Y. Suzuki

摘要:

通过分析下一代中微子振荡实验的数据,对中微子-核反应的精确描述将在解决轻子CP破坏和中微子质量分级等基本问题中发挥关键作用。与中微子-核反应相关的中微子能量范围很广,因此,主要的反应机制在整个能量区域内从准弹性散射到核子共振激发到深度非弹性散射。这对应于理论描述的有效自由度从核子到介子-重子到夸克的转变。这篇综述的主要目的是报告我们最近的努力,在广泛的能量范围内的中微子-核反应的统一描述,最近在该领域的总体进展也勾勒。首先概述了中微子-核散射实验的现状,我们制定了截面,通常用于所有的能量区域的反应。接着描述了中微子-核子反应,特别是详细讨论了$Δ$(1232)区内外介子产生的动力学耦合通道模型。然后,我们讨论中微子核反应,把重点放在我们的理论方法。我们从用关联高斯方法研究的少核子系统中的电弱过程开始讨论。然后我们用核谱函数描述准弹性散射,用$Δ$-空穴模型描述介子产生。通过全局分析确定的部分子分布函数的核修改也进行了讨论。最后,我们讨论了未来发展需要解决的问题。

英文摘要:

A precise description of neutrino-nucleus reactions will play a key role in addressing fundamental questions such as the leptonic CP violation and the neutrino mass hierarchy through analyzing data from next-generation neutrino oscillation experiments. The neutrino energy relevant to the neutrino-nucleus reactions spans a broad range and, accordingly, the dominant reaction mechanism varies across the energy region from quasi-elastic scattering through nucleon resonance excitations to deep inelastic scattering. This corresponds to transitions of the effective degree of freedom for theoretical description from nucleons through meson-baryon to quarks. The main purpose of this review is to report our recent efforts towards a unified description of the neutrino-nucleus reactions over the wide energy range; recent overall progress in the field is also sketched. Starting with an overview of the current status of neutrino-nucleus scattering experiments, we formulate the cross section to be commonly used for the reactions over all the energy regions. A description of the neutrino-nucleon reactions follows and, in particular, a dynamical coupled-channels model for meson productions in and beyond the $Δ$(1232) region is discussed in detail. We then discuss the neutrino-nucleus reactions, putting emphasis on our theoretical approaches. We start the discussion with electroweak processes in few-nucleon systems studied with the correlated Gaussian method. Then we describe quasi-elastic scattering with nuclear spectral functions, and meson productions with a $Δ$-hole model. Nuclear modifications of the parton distribution functions determined through a global analysis are also discussed. Finally, we discuss issues to be addressed for future developments.

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