The hadron spectrum from QCD sum-rules

QCD 求和规则的强子谱

• 批准号: 327548-2010
• 负责人: Harnett, Derek
• 金额: $ 1.09万
• 依托单位: Fraser Valley
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Individual
• 财政年份: 2010
• 资助国家: 加拿大
• 起止时间: 2010-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=457983
• 关键词: hadron; spectrum; QCD; sum; rules

Particle physics is the study of matter and forces at the smallest known distance scales. As we move to smaller and smaller distances, a certain hierarchy emerges: matter is made of molecules, molecules are made of atoms, atoms are made of electrons and nuclei, and nuclei are made of protons and neutrons. It was realized in the 1970's that protons and neutrons themselves are made of even smaller particles called quarks. The force responsible for holding the quarks together is called the strong nuclear force and the corresponding physical theory is called quantum chromodynamics (QCD). Quark combinations aside from protons and neutrons are also possible, and the resulting bound states are collectively referred to as hadrons. An important problem currently being researched in particle physics is that of trying to predict the properties of these hadrons based on known properties of the quarks that each contains. Such properties include mass, lifetime, and decay modes. In particular, I am investigating an as yet undiscovered class of particles called hybrids whose existence is predicted by theory. However, such particles have yet to be conclusively identified in experiment.

粒子物理学是在已知的最小距离尺度上研究物质和力的科学。 当我们移动到越来越小的距离时，一定的层次出现了：物质由分子组成，分子由原子组成，原子由电子和原子核组成，原子核由质子和中子组成。 人们在20世纪70年代认识到，质子和中子本身是由更小的粒子夸克组成的。 负责将夸克保持在一起的力称为强核力，相应的物理理论称为量子色动力学（QCD）。 除了质子和中子之外，夸克的组合也是可能的，由此产生的束缚态统称为强子。 粒子物理学目前正在研究的一个重要问题是，试图根据每个夸克所包含的已知性质来预测这些强子的性质。 这些属性包括质量、寿命和衰变模式。 特别是，我正在研究一类尚未发现的粒子，称为杂交体，其存在是由理论预测的。 然而，这种粒子还没有在实验中得到最终的确认。