Status of Lattice QCD Determination of Nucleon Form Factors and Their Relevance for the Few-GeV Neutrino Program
Status of Lattice QCD Determination of Nucleon Form Factors and Their Relevance for the Few-GeV Neutrino Program
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核子形状因子的晶格 QCD 测定现状及其与少 GeV 中微子计划的相关性
DOI：
10.1146/annurev-nucl-010622-120608
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发表时间：
2022
影响因子：
12.4
通讯作者：
C. Wilkinson
中科院分区：
文献类型：
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作者：
A. Meyer;A. Walker;C. Wilkinson
中微子-核子截面的计算从中微子-核子相互作用开始，使后者对旗舰中微子振荡实验至关重要，尽管测量有限，统计数据很差。或者，晶格量子色动力学(LQCD)可以用来从具有可量化理论不确定性的标准模型中确定这些相互作用。最近GA的LQCD结果与数据符合得很好，预算完全不确定的(准)弹性核子形状因子的结果有望在几年内得到。我们回顾了核子轴向形状因子FA(Q2)的场状态和LQCD结果，它是模拟亚GeV中微子-核子相互作用的一个主要不确定性来源。不同LQCD计算的结果是一致的，但总体上与现有的模型不一致，这可能会对当前和未来的中微子振荡实验产生影响。我们描述了一个路线图，以巩固对LQCD结果的信心，并讨论了未来更复杂的过程的计算，这对低GeV中微子振荡实验是重要的。预计《核科学与粒子科学年度评论》第72卷的最终在线出版日期为2022年9月。有关修订后的估计数字，请参阅http://www.annualreviews.org/page/journal/pubdates。
Calculations of neutrino–nucleus cross sections begin with the neutrino–nucleon interaction, making the latter critically important to flagship neutrino oscillation experiments despite limited measurements with poor statistics. Alternatively, lattice quantum chromodynamics (LQCD) can be used to determine these interactions from the Standard Model with quantifiable theoretical uncertainties. Recent LQCD results of gA are in excellent agreement with data, and results for the (quasi-)elastic nucleon form factors with full uncertainty budgets are expected within a few years. We review the status of the field and LQCD results for the nucleon axial form factor, FA( Q2), a major source of uncertainty in modeling sub-GeV neutrino–nucleon interactions. Results from different LQCD calculations are consistent but collectively disagree with existing models, with potential implications for current and future neutrino oscillation experiments. We describe a road map to solidify confidence in the LQCD results and discuss future calculations of more complicated processes, which are important to few-GeV neutrino oscillation experiments. Expected final online publication date for the Annual Review of Nuclear and Particle Science, Volume 72 is September 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.