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，在更基本的层面上，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，在该理论中，夸克通过被称为胶子的其他粒子的交换相互作用。有趣的是，胶子实际上可以通过同样的胶子交换直接与夸克和其他胶子相互作用，这种胶子交换调解了夸克之间的强大作用力。通过这种方式，量子色动力学预测，胶子可以在通过强烈的核相互作用而聚集在一起的束束态中充当基本成分。杂化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都进行了40多年的研究，但它们还没有在实验中得到最终确认。要将一种粒子确定为混合体，需要在各种粒子特性的理论和实验之间取得一致。我的研究计划致力于在理论上计算这些性质，以便指导实验搜索和解释获得的数据。广义地说，我的工作是发现研究，目的是更好地理解强烈的核相互作用。

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.