QCD at scales of a few GeV

几 GeV 尺度的 QCD

• 批准号: 5361412
• 负责人: Professor Dr. Vladimir Braun
• 金额: --
• 依托单位: Institut für Theoretische Physik
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2002
• 资助国家: 德国
• 起止时间: 2001-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5361412?language=en
• 关键词: QCD; scales; few; GeV

In the last ten years lattice QCD has developed into a powerful tool for calculating nonperturbative hadron properties with controllable precision. Since only a few of the simplest quantities can be calculated directly, the combination of lattice calculations with other perturbative and non-perturbative approaches to QCD has the broadest perspective. We propose making lattice calculations in three areas: 1) Transition form factors, in particular for the transition Ng > D. 2) The magnetic susceptibility of the quark condensate, which is important for understanding nucleon magnetic moments. 3) Hadronic matrix elements (such as bag parameters) needed to calculate decay rates in b-quark physics. These calculations are particularly timely because, with the help of the operator product expansion and QCD sum rules, they can be used to calculate several observables that are relevant for ongoing experiments at TJNAF, HERMES and B-factories.

近十年来，格点QCD已发展成为计算非微扰强子性质的强有力工具。由于只有少数最简单的量可以直接计算，晶格计算与其他微扰和非微扰方法相结合的QCD具有最广泛的前景。我们建议在三个方面进行晶格计算：1）过渡形状因子，特别是对于过渡Ng > D。2)夸克凝聚体的磁化率，这对理解核子磁矩是很重要的。3)强子矩阵元素（如袋参数）需要计算衰变率在b夸克物理。这些计算是特别及时的，因为，与运营商的产品扩展和QCD求和规则的帮助下，他们可以用来计算几个观察到的相关正在进行的实验在TJNAF，爱马仕和B-工厂。