Properties of Hybrids from QCD Sum-Rules

强核相互作用是负责将原子核内的质子和中子结合在一起的力，或者，在更基本的水平上，它是负责将质子和中子本身内部的夸克结合在一起的力。 量子色动力学是描述强核相互作用的理论，在其中，夸克通过交换其他称为胶子的粒子相互作用。 有趣的是，胶子实际上可以直接与夸克和其他胶子相互作用，通过同样的胶子交换，介导夸克之间的强力。 这样，量子色动力学预言胶子可以作为强核相互作用结合在一起的束缚态中的基本成分。 混合体是一种假设的束缚态，包含夸克和胶子成分，尽管理论家和实验学家进行了40多年的研究，但它们仍然没有在实验中得到最终的确认。 将一个粒子标记为杂化体需要理论和实验之间关于粒子性质的一致性。 我的研究计划致力于在理论方面计算这些性质，以指导实验研究和解释所获得的数据。 从广义上讲，我的工作是发现研究，旨在更好地理解强核相互作用。

The strong nuclear interaction is the force responsible for binding together protons and neutrons inside atomic nuclei, or, on a more fundamental level, it is the force responsible for binding quarks together inside the protons and neutrons themselves. Quantum chromodynamics is the theory that describes the strong nuclear interaction, and, in it, quarks interact with one another through the exchange of other particles called gluons. Interestingly enough, gluons can actually interact directly with quarks and other gluons through the same gluon exchange that mediates the strong force between quarks. In this way, quantum chromodynamics predicts that gluons can act as fundamental constituents inside bound states held together by the strong nuclear interaction. Hybrids are hypothesized bound states containing both quark and gluon constituents, and, despite more than four decades of searching by theoreticians and experimentalists alike, they have yet to be conclusively identified in experiment. Definitively labelling a particle a hybrid will require agreement between theory and experiment concerning a variety of particle properties. My research program is devoted to computing these properties on the theoretical side in order to guide experimental searches and to interpret the data obtained. Broadly speaking, my work is discovery research aimed at a better understanding of the strong nuclear interaction.