Multi-particle-state contributions to hadronic correlation functions using chiral perturbation theory

使用手性微扰理论的多粒子态对强子相关函数的贡献

• 批准号: 313770616
• 负责人: Professor Dr. Agostino Patella, since 8/2020
• 金额: --
• 依托单位: Institut für Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/313770616?language=en
• 关键词: Multi; particle; state; contributions; hadronic

Current and future lattice QCD simulations with physically light pion masses face new challenges. Multi-particle states with one or more pions cause sizable multi-particle-state contaminations in hadronic correlation functions, leading to large systematic uncertainties in the observables computed by numerical simulations. Chiral perturbation theory, the low-energy effective theory for QCD, can be used to compute analytically these multi-particle-state contaminations. In this project we perform these perturbative calculations for various hadronic structure observables (e.g. the axial, pseudoscalar and electromagnetic form factors) and the form factors relevant for semi- leptonic B to pi decays. Our final results can be used to analytically remove the multi-particle-state contaminations for these observables in the analysis of numerical lattice data, thus eliminating an uncertainty that otherwise would result in a systematic error that is hard to quantify.

当前和未来的物理轻π介子质量的晶格 QCD 模拟面临着新的挑战。具有一个或多个π介子的多粒子态会导致强子相关函数中相当大的多粒子态污染，从而导致通过数值模拟计算的可观测值存在较大的系统不确定性。手性微扰理论（QCD 的低能有效理论）可用于分析计算这些多粒子态污染。在这个项目中，我们对各种强子结构可观测值（例如轴向、赝标量和电磁形状因子）以及与半轻子 B 到 pi 衰变相关的形状因子进行微扰计算。我们的最终结果可用于在数值晶格数据分析中分析消除这些可观测量的多粒子态污染，从而消除不确定性，否则会导致难以量化的系统误差。